#conic_section__conicsection__conic  (geometry) a curve generated by the intersection of a plane and a circular cone
  supertype:  plane_figure__planefigure__two-dimensional_figure__twodimensionalfigure  a two-dimensional shape
  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

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