#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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