#curved_shape__curve  the trace of a point whose direction of motion changes
  exclusion:  straight_line
  supertype:  line.shape  a length (straight or curved) without breadth or thickness; the trace of a moving point
  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

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