#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"
  exclusion:  #curved_shape
  supertype:  #line.shape  a length (straight or curved) without breadth or thickness; the trace of a moving point
  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

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