#shape__form the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
supertype: space (pm) point or extent in space
subtype: solid.shape a three-dimensional shape
subtype: convex_shape__convexity a shape that curves or bulges outward
subtype: umbo a slight rounded elevation where the malleus attaches to the eardrum
subtype: camber.convex_shape a slight convexity (as of the surface of a road)
subtype: node.convex_shape__knob__thickening any thickened enlargement
subtype: ridge.convex_shape any long raised strip
subtype: raphe__rhaphe a ridge that forms a seam between two parts
subtype: palatine_raphe the seam at the middle of the hard palate
subtype: corrugation a ridge on a corrugated surface
subtype: point.convex_shape__tip a V shape; "the cannibal's teeth were filed to sharp points"
subtype: widow's_peak__widow'speak a V-shaped point in the hairline in the middle of the forehead
subtype: cusp.point small elevation on the grinding surface of a tooth
subtype: head.point the tip of an abscess (where the pus accumulates)
subtype: taper.convex_shape a convex shape that narrows toward a point
subtype: projection.convex_shape any solid convex shape that juts out from something
subtype: salient (military) the part of the line of battle that projects closest to the enemy
subtype: jag.projection a sharp projection on an edge or surface; "he clutched a jag of the rock"
subtype: bulge__bump__hump__gibbosity__gibbousness__gibbousnes__prominence__protuberance__protrusion__extrusion__excrescence something that bulges out or is protuberant or projects from a form
subtype: frontal_eminence__frontaleminence either prominence of the frontal bone above each orbit
subtype: occipital_protuberance__occipitalprotuberance prominence on the outer surface of the occipital bone
subtype: caput a headlike protuberance on an organ or structure; "the caput humeri is the head of the humerus which fits into a cavity in the scapula"
subtype: nub a small lump or protuberance
subtype: wart any small rounded protuberance (as on certain plants or animals)
subtype: spur.projection__spine any pointed projection
subtype: tail_end__tail any projection that resembles the tail of an animal
subtype: tongue.projection__knife any long thin projection that is transient; "tongues of flame licked at the walls"; "rifles exploded quick knives of fire into the dark"
subtype: concave_shape__concaveshape__concavity a shape that curves inward
subtype: fossa__pit a concavity in a surface (especially an anatomical depression)
subtype: glenoid_cavity__glenoidcavity__glenoid_fossa__glenoidfossa the concavity in the head of the scapula that receives the head of the humerus to form the shoulder joint
subtype: glenoid_fossa__glenoidfossa__mandibular_fossa a deep concavity in the temporal bone at the root of the zygomatic arch that receives the condyle of the mandible
subtype: pit_of_the_stomach__epigastric_fossa a slight depression in the midline just below the sternum (where a blow can affect the solar plexus)
subtype: recess.concave_shape__reces__recession__niche__corner a small concavity
subtype: pharyngeal_recess a small recess in the wall of the pharynx
subtype: bowl.concave_shape__trough a concave shape with an open top
subtype: scoop.concave_shape__pocket a hollow concave shape made by removing something
subtype: depression.concave_shape__impression__imprint a concavity in a surface produced by pressing; "he left the impression of his fingers in the soft mud"
subtype: dimple a small natural hollow in the cheek or chin; "His dimple appeared whenever he smiled"
subtype: groove__channel a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)
subtype: dado a rectangular groove cut into a board so that another piece can fit into it
subtype: flute a groove or furrow in cloth etc especially the shallow concave groove on the shaft of a column
subtype: quirk a narrow groove beside a beading
subtype: rabbet__rebate a rectangular groove made to hold two pieces together
subtype: track.groove a groove on a phonograph recording
subtype: rut a groove or furrow (especially one in soft earth caused by wheels)
subtype: stria__striation any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue
subtype: dimple.depression any slight depression in a surface; "there are approximately 336 dimples on a golf ball"
subtype: dip.depression a depression in an otherwise level surface; "there was a dip in the road"
subtype: incision__scratch__slit__dent a depression scratched or carved into a surface
subtype: scotch__score a slight surface cut (especially a notch that is made to keep a tally)
subtype: sag__droop a shape that sags; "there was a sag in the chair seat"
subtype: wrinkle__furrow__crease__crinkle__seam__line a slight depression in the smoothness of a surface; "his face has many lines"; "ironing gets rid of most wrinkles"
subtype: crow's_foot__crow's_feet__laugh_line__laughline a wrinkle at the outer corner of your eyes
subtype: dermatoglyphic the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet)
subtype: line_of_life__life_line__lifeline a crease on the palm; its length is said by palmists to indicate how long you will live
subtype: line_of_heart__heart_line__heartline__love_line__mensal_line a crease on the palm; palmists say it indicates your emotional nature
subtype: line_of_fate__line_of_destiny__line_of_Saturn a crease on the palm; palmists say it indicates how successful you will be
subtype: crevice__cranny__crack__fissure__chap a long narrow depression in a surface
subtype: cup.concave_shape any cup-shaped concavity; "bees filled the waxen cups with honey"; "he wore a jock strap with a metal cup"; "the cup of her bra"
subtype: indentation.concave_shape a concave shape in a surface or edge or coastline etc.
subtype: notch.indentation a V-shaped or U-shaped indentation carved or scratched into a surface; "there were four notches in the handle of his revolver"
subtype: serration a single notch in a row of notches; "one of the serrations was broken off"
subtype: sawtooth a serration on a saw blade
subtype: thumb_index__thumbindex one of a series of rounded notches in the fore edge of a book to indicate sections
subtype: notch a V-shaped indentation; "mandibular notch"
subtype: incisure__incisura (anatomy) a notch or small hollow
subtype: mandibular_notch small indentation in the middle of the lower jawbone
subtype: cleft a split or indentation in something (as the palate or chin)
subtype: cylinder.solid a solid bounded by a cylindrical surface and two parallel planes (the bases)
subtype: roll.cylinder anything rolled up in cylindrical form
subtype: bolt.roll a roll of cloth or wallpaper of a definite length
subtype: rouleau a roll of coins wrapped in paper
subtype: rouleau.roll a roll of ribbon
subtype: roller.cylinder a cylinder that revolves
subtype: garden_roller heavy cast-iron cylinder used to flatten lawns
subtype: paint_roller__paintroller a roller that has an absorbent surface used for spreading paint
subtype: platen the roller on a typewriter against which the keys strike
subtype: sprocket roller that has teeth on the rims to pull film or paper through
subtype: trundle small wheel or roller
subtype: prayer_wheel a cylinder with Tibetan Buddhist prayers written on it; each revolution counts as uttering prayers
subtype: polyhedron a solid figure bounded by plane polygons or faces
subtype: convex_polyhedron a polyhedron any plane section of which is a convex polygon
subtype: concave_polyhedron__concavepolyhedron a polyhedron some of whose plane sections are concave polygons
subtype: prism a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
subtype: parallelepiped__parallelopiped__parallelepipedon__parallelopipedon a prism whose bases are parallelograms
subtype: cuboid a rectangular parallelepiped
subtype: rhombohedron a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
subtype: quadrangular_prism a prism whose bases are quadrangles
subtype: triangular_prism a prism whose bases are triangles
subtype: pyramid.polyhedron a polyhedron having a polygonal base and triangular sides with a common vertex
subtype: tetrahedron any polyhedron having four plane faces
subtype: pentahedron any polyhedron having five plane faces
subtype: hexahedron any polyhedron having six plane faces
subtype: rhombohedron a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)
subtype: octahedron any polyhedron having eight plane faces
subtype: decahedron any polyhedron having ten plane faces
subtype: dodecahedron any polyhedron having twelve plane faces
subtype: icosahedron any polyhedron having twenty plane faces
subtype: regular_polyhedron__regularpolyhedron__regular_convex_solid__regular_convex_polyhedron__Platonic_body__Platonic_solid__ideal_solid__idealsolid any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
subtype: regular_tetrahedron__regulartetrahedron a tetrahedron with four equilateral triangular faces
subtype: cube__regular_hexahedron__regularhexahedron a hexahedron with six equal squares as faces
subtype: quadrate.cube a cubelike object
subtype: regular_dodecahedron__regulardodecahedron a dodecahedron with twelve regular pentagons as faces
subtype: regular_octahedron__regularoctahedron an octahedron with eight equilateral triangles as faces
subtype: regular_icosahedron__regularicosahedron an icosahedron with twenty equilateral triangles as faces
subtype: prismatoid a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid
subtype: prismoid a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms
subtype: trapezohedron a polyhedron whose faces are trapeziums
subtype: toroid the doughnut-shaped object enclosed by a torus
subtype: anchor_ring__ring__halo__annulus__annulu__anulus__doughnut a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
subtype: fairy_ring__fairyring__fairy_circle__fairycircle a ring of fungi marking the periphery of the perennial underground growth of the mycelium
subtype: cast.solid__mold__stamp the distinctive form in which a thing is made; "pottery of this cast was found throughout the region"
subtype: block.solid__cube a three-dimensional shape with six square or rectangular sides
subtype: goldbrick.block a brick-shaped block that looks like gold but is not
subtype: ovoid an egg-shaped object
subtype: frustum the part that is left when a cone or pyramid is cut by a plane parallel to the base and the apical part is removed
subtype: truncated_pyramid__truncatedpyramid a frustum formed from a pyramid
subtype: truncated_cone__truncatedcone a frustum formed from a cone
subtype: plane.shape__sheet (mathematics) an unbounded two-dimensional shape; "we will refer to the plane of the graph as the X-Y plane"; "any line joining two points on a plane lies wholly on that plane"
subtype: facet_plane__facetplane the plane of a facet of an object (as of a cube)
subtype: midplane__midline the median plane of the body (or some part of the body)
subtype: orbital_plane__orbitalplane (astronomy) the plane on which a body is orbiting
subtype: picture_plane__pictureplane the plane that is in the foreground of a drawing or painting; coextensive with but different from the objective surface of the work
subtype: tangent_plane__tangentplane the plane that contains all the lines tangent to a specific point on a surface
subtype: natural_shape__naturalshape a shape created by natural forces; not man-made
subtype: leaf_shape__leaf_form any of the various shape that leaves of plants can assume
subtype: flare.shape a shape that spreads outward; "the skirt had a wide flare"
subtype: figure.shape a combination of points and lines and planes that form a visible palpable shape
subtype: plane_figure__planefigure__two-dimensional_figure__twodimensionalfigure a two-dimensional shape
subtype: heart.plane_figure a plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines; "he drew a heart and called it a valentine"
subtype: polygon__polygonal_shape__polygonalshape a closed plane figure bounded by straight sides
subtype: convex_polygon a polygon such that no side extended cuts any other side or vertex; it can be cut by a line in at most two points
subtype: concave_polygon__concavepolygon a polygon such that there is a straight line that cuts it in four or more points
subtype: reentrant_polygon__reentrantpolygon__reentering_polygon a polygon with one or more reentrant angles
subtype: regular_polygon a polygon with all sides and all angles equal
subtype: equilateral_triangle__equilateraltriangle__equiangular_triangle__equiangulartriangle a three-sided regular polygon
subtype: quadrilateral__quadrangle__tetragon a four-sided polygon
subtype: parallelogram a quadrilateral whose opposite sides are both parallel and equal in length
subtype: rhombus__rhombu__rhomb a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
subtype: rhomboid a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
subtype: rectangle a parallelogram with four right angles
subtype: square__foursquare (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon; "you can compute the area of a square if you know the length of its sides"
subtype: quadrate a square-shaped object
subtype: box.rectangle a rectangular drawing; "the flowchart contained many boxes"
subtype: trapezium (in US) a quadrilateral with no parallel sides
subtype: trapezoid (in US) a quadrilateral with two parallel sides
subtype: trigon__triangle__trilateral a three-sided polygon
subtype: acute_triangle__acutetriangle__acute-angled_triangle a triangle whose interior angles are all acute
subtype: equilateral_triangle__equilateraltriangle__equiangular_triangle__equiangulartriangle a three-sided regular polygon
subtype: isosceles_triangle__isoscelestriangle a triangle with two equal sides
subtype: oblique_triangle__obliquetriangle a triangle that contains no right angle
subtype: obtuse_triangle__obtuse-angled_triangle a triangle that contains an obtuse interior angle
subtype: right_triangle__righttriangle__right-angled_triangle a triangle with one right angle
subtype: scalene_triangle__scalenetriangle a triangle with no two sides of equal length
subtype: wedge_shape__wedgeshape__wedge__cuneus any shape that is triangular in cross section
subtype: pentagon a five-sided polygon
subtype: hexagon a six-sided polygon
subtype: heptagon a seven-sided polygon
subtype: octagon an eight-sided polygon
subtype: nonagon a nine-sided polygon
subtype: decagon a polygon with 10 sides and 10 angles
subtype: undecagon an eleven-sided polygon
subtype: dodecagon a twelve-sided polygon
subtype: spherical_polygon__sphericalpolygon a figure on the surface of of sphere bounded by arcs of 3 or more great circles
subtype: spherical_triangle__sphericaltriangle a spherical polygon formed by the arcs of 3 great circles
subtype: conic_section__conicsection__conic (geometry) a curve generated by the intersection of a plane and a circular cone
subtype: ellipse__oval a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; "the sums of the distances from the foci to any point on an ellipse is constant"
subtype: circle ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"
subtype: circle_of_curvature__osculating_circle the circle that touches a curve (on the concave side) and whose radius is the radius of curvature
subtype: equator.circle a circle dividing a sphere or other surface into two usually equal and symmetrical parts
subtype: epicycle a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid
subtype: parabola a plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curve
subtype: hyperbola an open curve formed by a plane that cuts the base of a right circular cone
subtype: oblong a plane figure that deviates from a square or circle due to elongation
subtype: semicircle__hemicycle a plane figure with the shape of half a circle
subtype: sector a plane figure bounded by two radii and the included arc of a circle
subtype: star.plane_figure a plane figure with 5 or more points; often used as an emblem
subtype: hexagram a regular polygon formed by completing two equilateral triangles from a regular hexagon
subtype: asterism.star (mineralogy) a six-rayed star-shaped figure seen in some crystal structures under reflected or transmitted light
subtype: pentacle__pentagram a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon
subtype: paraboloid a surface having parabolic sections parallel to a single coordinate axis and elliptic sections perpendicular to that axis
subtype: ellipsoid a surface whose plane sections are all ellipses or circles; "the Earth is an ellipsoid"
subtype: tree_diagram__tree a figure that branches from a single root; "genealogical tree"
subtype: cladogram a tree diagram used to illustrate phylogenetic relationships
subtype: solid_figure__solidfigure__three-dimensional_figure__threedimensionalfigure a three-dimensional shape
subtype: sculpture.plastic_art a three-dimensional work of plastic art
subtype: bronze.sculpture a sculpture made of bronze
subtype: bust a sculpture of the head and shoulders of a person
subtype: carving.sculpture a sculpture created by carving (as wood or ivory or stone)
subtype: cinquefoil an ornamental carving consisting of five arcs arranged in a circle
subtype: glyptic_art__glypticart__glyptography carvings or engravings (especially on precious stones)
subtype: anaglyph anything carved in low relief
subtype: cameo engraving or carving in low relief on a stone (as in a brooch or ring)
subtype: glyph glyptic art in the form of a symbolic figure carved or incised in relief
subtype: glyptics__lithoglyptics the art of engraving on precious stones
subtype: intaglio__diaglyph glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo)
subtype: scrimshaw a carving (or engraving) on whalebone, whale ivory, walrus tusk, etc., usually by American whalers
subtype: vermiculation a decoration consisting of wormlike carvings
subtype: woodcarving a carving created by carving wood
subtype: marble.sculpture a sculpture carved from marble
subtype: mobile sculpture suspended in midair whose delicately balanced parts can be set in motion by air currents
subtype: clay_sculpture__mold__mould__molding__moulding__modeling sculpture produced by molding
subtype: piece.sculpture an object created by a sculptor; "it was not known who created the piece"
subtype: sculptural_relief__relief__relievo__rilievo__embossment sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background
subtype: alto_relievo__alto_rilievo__high_relief a sculptural relief in which forms extend out from the background to at least half their depth
subtype: bas_relief__basrelief__low_relief__lowrelief__basso_relievo__bassorelievo__basso_rilievo__bassorilievo a sculptural relief in which forms extend only slightly from the background; no figures are undercut
subtype: mezzo-relievo__mezzorelievo__mezzo-rilievo__mezzorilievo__half-relief a sculptural relief between low relief and high relief
subtype: stabile a sculpture having fixed units (usually constructed of sheet metal) and attached to a fixed support
subtype: statue a sculpture representing a human or animal
subtype: sphinx one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians
subtype: Statue_of_Liberty a large monumental statue symbolizing liberty on Liberty Island in New York Harbor
subtype: subfigure a figure that is a part of another figure
subtype: flank.subfigure a subfigure consisting of a side of something
subtype: hypotenuse the side of a right triangle opposite the right angle
subtype: base.flank the bottom side of a geometric figure from which the altitude can be constructed; "the base of the triangle"
subtype: hemisphere.subfigure half of a sphere
subtype: facet a smooth surface (as of a bone or cut gemstone)
subtype: branch.subfigure__fork__leg a part of a forked or branching shape; "he broke off one of the branches"; "they took the south fork"
subtype: brachium (biology) a branching or armlike part of an animal
subtype: thing_with_a_special_shape
subtype: flat_thing
subtype: car_with_a_special_shape
subtype: station_wagon__stationwagon__beach_wagon__beachwagon__wagon__beach_waggon__beachwaggon__station_waggon__stationwaggon__waggon a car that has a long body and rear door with space behind rear seat
subtype: convertible a car that has top that can be folded or removed
subtype: hardtop a car that resembles a convertible but has a fixed rigid top
subtype: coupe a car with two doors and front seats and a luggage compartment
subtype: minicar (British) a car that is even smaller than a subcompact car
subtype: minicab (British) a minicar used as a taxicab
subtype: minivan a small box-shaped passenger van; usually has removable seats; used as a family car
subtype: jeep__landrover a car suitable for traveling over rough terrain
subtype: limousine__limo large luxurious car; usually drive by a chauffeur
subtype: berlin a limousine with a glass partition between the front and back seats
subtype: compact_car__compactcar__compact a small and economical car
subtype: subcompact_car__subcompact a car smaller than a compact car
subtype: roadster__runabout__two-seater__twoseater an open automobile having a front seat and a rumble seat
subtype: touring_car__touringcar__phaeton__tourer large open car seating four with folding top
subtype: line.shape a length (straight or curved) without breadth or thickness; the trace of a moving point
subtype: curve a line on a graph representing data
subtype: regression_line__regression_curve a smooth curve fitted to the set of paired data in regression analysis; for linear regression the curve is a straight line
subtype: curved_shape__curve the trace of a point whose direction of motion changes
subtype: normal_curve__bell-shaped_curve__Gaussian_curve__Gaussian_shape a symmetrical curve representing the normal distribution
subtype: meander a curve in a stream
subtype: oxbow.meander a U-shaped curve in a stream
subtype: S-shape a double curve resembling the letter S
subtype: catenary the curve theoretically assumed by a perfectly flexible and inextensible cord of uniform density and cross section hanging freely from two fixed points
subtype: Cupid's_bow.curved_shape__cupid'sbow the double curve of the upper lip when considered to resemble Cupid's bow
subtype: wave.curved_shape an undulating curve
subtype: sine_curve__sinusoid the curve of y=sin x
subtype: extrados the exterior curve of an arch
subtype: gooseneck something in a thin curved form (like the neck of a goose)
subtype: intrados the interior curve of an arch
subtype: crook__bend__turn a circular segment of a curve: "a bend in the road"; "a crook in the path"
subtype: bight.crook a bend or curve (especially in a coastline)
subtype: hook.curved_shape__crotchet a sharp curve or crook; a shape resembling a hook
subtype: uncus__uncu (biology) any hook-shaped process or part
subtype: envelope.curved_shape a curve that is tangent to each of a family of curves
subtype: arc a continuous portion of a circle
subtype: crenation__scallop one of a series of rounded teeth formed by curves along an edge (as the edge of a leaf or piece of cloth etc.)
subtype: spiral.curved_shape a plane curve traced by a point circling about the center but at ever-greater distances from it
subtype: helix__spiral a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle
subtype: sinuosity__sinuousness__sinuousnes having curves; "he hated the sinuosity of mountain roads"
subtype: arch.curved_shape a curved shape in the vertical plane that spans an opening
subtype: bell_shape__bell__campana the shape of a bell
subtype: bow.curved_shape__arc something curved in shape
subtype: rainbow an arc of colored light in the sky caused by refraction of the sun's rays by rain
subtype: crescent any shape resembling the curved shape of the moon in its first or last quarters
subtype: quadric_surface__quadricsurface__quadric a curve or surface whose equation (in Cartesian coordinates) is of the second degree
subtype: hyperboloid a quadric surface generated by rotating a hyperbola around its main axis
subtype: line_roulette__roulette a line generated by a point on one figure rolling around a second figure
subtype: cycloid a line generated by a point on a circle rolling along a straight line
subtype: curate_cycloid a cycloid generated by a point inside the rolling circle
subtype: prolate_cycloid a cycloid generated by a point outside the rolling circle
subtype: epicycloid a line generated by a point on a circle rolling around another circle
subtype: cardioid an epicycloid in which the rolling circle equals the fixed circle
subtype: hypocycloid a line generated by a point on a circle that rolls around inside another circle
subtype: straight_line a line traced by a point traveling in a constant direction; a line of zero curvature; "the shortest distance between two points is a straight line"
subtype: perpendicular.straight_line a straight line at right angles to another line
subtype: asymptote a straight line that is the limiting value of a curve; can be considered as tangent at infinity; "the asymptote of the curve"
subtype: tangent a straight line that touches but does not intersect a curve
subtype: secant a straight line that intersects a curve at two or more points
subtype: radius.straight_line a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
subtype: diameter.straight_line a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
subtype: chord.straight_line a straight line connecting two points on a curve
subtype: element.straight_line a straight line that generates a cylinder or cone
subtype: element_of_a_cone a straight line joining the apex and a point on the base
subtype: element_of_a_cylinder a straight line running the length of the cylinder
subtype: bias__diagonal a line or cut across a fabric that is not at right angles to a side
subtype: diagonal.straight_line (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
subtype: vector.straight_line a straight line segment whose length is magnitude and whose orientation in space is direction
subtype: ray.vector (mathematics) a straight line extending from a point
subtype: geodesic_line__geodesic (mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or a an arc of a great circle on a sphere)
subtype: perimeter a line enclosing a plane areas
subtype: centerline__center_line a line that bisects a plane figure
subtype: boundary__edge__bound a line determining the limits of an area
subtype: rim the shape of a raised edge of a more or less circular object
subtype: margin.boundary__border__perimeter the boundary line or the area immediately inside the boundary
subtype: periphery__fringe__outer_boundary__outerboundary the outside boundary or surface of something
subtype: brink.boundary__threshold__verge a region marking a boundary
subtype: upper_bound__upperbound (mathematics) a number equal to or greater than any other number in a given set
subtype: summit__crown__peak the uppermost part of a shape; "at the peak of the pyramid"
subtype: lower_bound__lowerbound (mathematics) a number equal to or less than any other number in a given set
subtype: thalweg.boundary the middle of the chief navigable channel of a waterway that forms the boundary line between states
subtype: angular_shape__angularshape__angularity a shape having one or more sharp angles
subtype: furcation__bifurcation__forking a division into two or more branches
subtype: jog a sharp change in direction; "there was a jog in the road"
subtype: zigzag__zig__zag an angular shape characterized by sharp turns in alternating directions
subtype: crease__fold__plication__flexure__crimp__bend an angular shape made by folding
subtype: pleat__plait any of various types of fold formed by doubling fabric back upon itself and then pressing or stitching into shape
subtype: box_pleat__boxpleat a flat double pleat made by folding under the fabric on either side of it
subtype: inverted_pleat a box pleat reversed so that the fullness is turned inward
subtype: kick_pleat pleat in back of a straight skirt to allow ease in walking
subtype: knife_pleat__knifepleat a single pleat turned in one direction
subtype: sunburst_pleat__sunray_pleat knife pleat cut on the bias to produce a flared effect
subtype: tuck a narrow flattened pleat or fold that is stitched in place
subtype: dart a tapered tuck made in dressmaking
subtype: kink__twist__twirl a sharp bend in a line produced when a line having a loop is pulled tight
subtype: pucker__ruck an irregular fold in an otherwise even surface (as in cloth)
subtype: round_shape__roundshape a shape that is curved and without sharp angles
subtype: cone_shape__cone__conoid a shape whose base is a circle and whose sides taper up to a point
subtype: funnel_shape__funnel a conical shape with a wider and a narrower opening at the two ends
subtype: disc__disk__saucer something with a round shape like a flat circular plate
subtype: intervertebral_disc__intervertebral_disk a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)
subtype: dot__point a very small circular shape; "a row of points"; "draw lines between the dots"
subtype: loop.round_shape anything with a round or oval shape (formed by a line or cord etc.) that is closed or nearly closed
subtype: belt.loop endless loop of flexible material between two rotating shafts or pulleys
subtype: caterpillar_tread__caterpillartread__caterpillar_tracks a belt around wheels to grip rough ground
subtype: half_track caterpillar tread goes around only rear wheels
subtype: conveyer_belt__conveyor_belt__conveyer__conveyor__transporter a moving belt that transports objects (as in a factory)
subtype: luggage_carousel__luggagecarousel__carousel__carrousel__luggagecarrousel carries luggage to air travelers
subtype: driving_belt__drivingbelt a belt that carries motion from a motor to the machinery
subtype: fan_belt__fanbelt a belt driven by the crankshaft that drives a fan that pulls air through the radiator
subtype: running_noose__runningnoose__noose__slip_noose a loop formed in a cord or rope by means of a slipknot; it binds tighter as the cord or rope is pulled
subtype: clench__clinch a small slip noose made with seizing
subtype: double_clinch a clinch with two loops
subtype: inside_clinch a clinch with the end of the line inside the loop
subtype: outside_clinch__outsideclinch a clinch with the end of the line outside the loop
subtype: lobe.loop the enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern
subtype: major_lobe__majorlobe the maximum lobe in the radiation pattern which is intended to be along the forward axis and which gives the effect of a beam
subtype: bight.loop a loop in a rope
subtype: gyre__coil__whorl__roll__curl__curlicue__ringlet__scroll a round shape formed by a series of concentric circles
subtype: verticil a whorl of leaves growing around a stem
subtype: swirl__whirl__vortex__convolution the shape of something rotating rapidly
subtype: spheroid__ellipsoid_of_revolution a shape that is generated by rotating an ellipse around one of its axes; "it looked like a sphere but on closer examination I saw it was really a spheroid"
subtype: sphere.round_shape a three-dimensional closed surface such that every point on the surface is equidistant from the center
subtype: physical_sphere__physicalsphere__sphere a solid figure bounded by a spherical surface (including the space it encloses)
subtype: orb__globe any object with a spherical shape; "a ball of fire"
subtype: crystal_ball__crystalball a glass or crystal globe used in crystal gazing by fortunetellers
subtype: mothball__camphor_ball__camphorball a small sphere of camphor or naphthalene used to keep moths away from stored clothing
subtype: time-ball a ball that slides down a staff to show a fixed time; especially at an observatory
subtype: fireball the luminous center of a nuclear explosion
subtype: fireball.orb a ball of fire (such as the sun or a ball-shaped discharge of lightning)
subtype: globule a small globe or ball
subtype: bubble a hollow globule of gas (e.g., air or carbon dioxide)
subtype: air_bubble__airbubble a bubble of air
subtype: froth__foam a mass of small bubbles formed in or on a liquid
subtype: shaving_foam__shavingfoam toiletry consisting of a liquid preparation containing many small bubbles that soften the beard before shaving
subtype: head.froth the foam or froth that accumulates at the top when you pour an effervescent liquid into a container; "the beer had a large head of foam"
subtype: lather the foam resulting from excessive sweating (as on a horse)
subtype: soapsuds__suds__lather the froth produced by soaps or detergents
subtype: shaving_cream__shavingcream__shaving_soap__shavingsoap toiletry consisting of a preparation of soap and fatty acids that forms a rich lather for softening the beard before shaving
subtype: spume foam or froth on the sea
subtype: white_water__whitewater frothy water as in rapids or waterfalls
subtype: soap_bubble a bubble formed by a thin soap film
subtype: spherule a small sphere
subtype: pellet a small sphere
subtype: bolus.orb__bolu a small round soft mass (as of chewed food)
subtype: cylinder.round_shape a surface generated by rotating a parallel line around a fixed line
subtype: brake_drum__brakedrum__drum a hollow cast-iron cylinder attached to the wheel that forms part of the brakes
subtype: shank cylinder forming the part of a bit by which it is held in the drill
subtype: bolt_shank__shank cylinder forming the part of a bolt between the thread and the head
subtype: shank.cylinder__stem cylinder forming a long narrow part of something
subtype: stalactite a cylinder of calcium carbonate hanging from the roof of a limestone cave
subtype: stalagmite a cylinder of calcium carbonate projecting upward from the floor of a limestone cave
subtype: barrel__drum a bulging cylindrical shape; hollow with flat ends
subtype: tube__pipe a hollow cylindrical shape
subtype: torus__toru__toroid a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
subtype: drop.round_shape__bead__pearl a shape that is small and round; "he studied the shapes of low-viscosity drops"; "beads of sweat on his forehead"
subtype: teardrop anything shaped like a falling drop (as a pendant gem on an earring)
subtype: dewdrop a drop of dew
subtype: rim the shape of a raised edge of a more or less circular object
subtype: distorted_shape__distortion a shape resulting from distortion
subtype: tortuosity__tortuousness__torsion__contortion__crookedness a tortuous and twisted shape or position; "they built a tree house in the tortuosities of its boughs"; "the acrobat performed incredible contortions"
subtype: warp.distorted_shape__buckle a shape distorted by twisting or folding
subtype: gnarl__knot something twisted and tight and swollen; "their muscles stood out in knots"; "the old man's fists were two great gnarls"; "his stomach was in knots"
subtype: amorphous_shape__amorphousshape an ill-defined or arbitrary shape
subtype: shapelessness.amorphous_shape__shapelessnes an amorphous or indefinite shape; "a shapeless mass"
subtype: blob an indistinct shapeless form
subtype: space.amorphous_shape an empty area (usually bounded in some way between things); "the architect left space in front of the building"; "they stopped at an open space in the jungle"; "the space between his teeth"
subtype: pleural_space__pleuralspace the small potential space between the parietal and visceral layers of the pleura
subtype: subarachnoid_space a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid
subtype: opening.space__gap an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
subtype: Ranvier's_nodes__nodes_of_Ranvier small gaps in the myelin sheath of medullated axons
subtype: foramen__hiatus a natural opening or perforation through a bone or a membranous structure
subtype: interventricular_foramen__foramen_of_Monro__Monro's_foramen the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
subtype: foramen_magnum__foramenmagnum the large opening at the base of the cranium through which the spinal cord passes
subtype: breach.opening an opening (especially a gap in a dike or fortification)
subtype: chasm a deep opening in the earth's surface
subtype: abyss__abys a bottomless gulf or pit
subtype: gulf.chasm a deep wide chasm
subtype: scissure__crack__cleft__crevice__fissure a long narrow opening
subtype: chap.scissure a crack in a lip caused usually by cold
subtype: chink a narrow opening as e.g. between planks in a wall
subtype: crevasse a deep fissure
subtype: fatigue_crack__fatiguecrack a crack in metal resulting from metal fatigue
subtype: geological_fault__fault__shift__fracture__break (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"
subtype: Denali_Fault a major open geological fault in Alaska
subtype: inclined_fault a geological fault in which one side is above the other
subtype: normal_fault__gravity_fault__common_fault an inclined fault in which the hanging wall appears to have slipped downward relative to the footwall
subtype: thrust_fault__overthrust_fault__reverse_fault__reversefault a geological fault in which the upper side appears to have been pushed upward by compression
subtype: strike-slip_fault a geological fault in which one of the adjacent surfaces appears to have moved horizontally
instance: San_Andreas_Fault
subtype: rift.scissure a narrow fissure in rock
subtype: slit.scissure a narrow fissure
subtype: split.scissure a lengthwise crack in wood; "he inserted the wedge into a split in the log"
subtype: vent.scissure__volcano a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
subtype: volcanic_crater__crater a bowl-shaped opening at the top of a volcano
subtype: caldera a large crater caused by the violent explosion of a volcano that collapses into a depression
subtype: maar a flat-bottomed volcanic crater that was formed by an explosion; often filled with water
subtype: hole.opening an opening into or through something
subtype: aperture.hole an opening in something
subtype: pupil contractile aperture in the iris of the eye
subtype: micropyle minute opening in the wall of an ovule through which the pollen tube enters
subtype: stoma.aperture__pore a minute epidermal pore in a leaf or stem
subtype: bolt-hole a hole through which an animal may bolt when pursued into its burrow or den
subtype: bullet_hole a hole made by a bullet passing through it
subtype: cranny a small opening or crevice (especially in a rock face or wall)
subtype: leak.hole an accidental hole that allows something (fluid or light etc.) to enter or escape; "one of the tires developed a leak"
subtype: ozone_hole__ozonehole an area of the ozone layer (near the poles) that is seasonally depleted of ozone
subtype: perforation.hole a hole made in something; "a perforation of the eardrum"
subtype: rathole a hole (as in the wall of a building) made by rats
subtype: knothole a hole in a board where a knot came out
subtype: mouth-like_space_opening__mouth an opening that resembles a mouth (as of a cave or a gorge); "he rode into the mouth of the canyon"; "they built a fire at the mouth of the cave"
subtype: rift a gap between cloud masses; "the sun shone through a rift in the clouds"
subtype: rip__rent__split__tear an opening made forcibly as by pulling apart; "there was a rip in his pants"
subtype: window.opening an opening that resembles a window in appearance or function; "he could see them through a window in the trees"
subtype: swath the space created by the swing of a scythe or the cut of a mowing machine
subtype: void__vacancy__emptines an empty area or space; "the huge desert voids"; "the emptiness of outer space"
subtype: hole.space an unoccupied space
subtype: pore any tiny hole admitting passage of a liquid (fluid or gas)
subtype: enclosed_space__cavity space that is surrounded by something
subtype: hollow a cavity or space in something; "hunger had caused the hollows in their cheeks"
subtype: pouch.enclosed_space__sac__sack__pocket an enclosed space
subtype: connexion__connection__link a connecting shape
subtype: node.connexion a connecting point at which several lines come together
subtype: join__articulation__joint__juncture__junction the shape or manner in which things come together and a connection is made
subtype: esophagogastric_junction__esophagogastricjunction__oesophagogastric_junction the junction between the esophagus and the stomach epithelium
subtype: circle.shape something approximating the shape of a circle; "the chairs were arranged in a circle"
subtype: column.shape__tower anything tall and thin approximating the shape of a column or tower; "the test tube held a column of white powder"; "a tower of dust rose above the horizon"; "a thin pillar of smoke betrayed their campsite"
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