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conoid	in geometry, a solid formed by the revolution of a conic section around its axis. [1/3 definitions]
ellipse	a closed geometric plane curve formed by the intersection of a plane at an oblique angle to the axis and opposite sides of a right circular cone; an oval conic section. [1/2 definitions]
hyperbola	a conic section consisting of two identical but opposite curves, which may be defined as the set of all points in a plane such that the distances of each point to two defined foci have a constant difference.

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