#line.shape a length (straight or curved) without breadth or thickness; the trace of a moving point
supertype: #shape__form the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
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
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