n. - Anything that has a form resembling that of a cone.
n. - A solid formed by the revolution of a conic section about
its axis; as, a parabolic conoid, elliptic conoid, etc.; -- more
commonly called paraboloid, ellipsoid, etc.
n. - A surface which may be generated by a straight line moving
in such a manner as always to meet a given straight line and a given
curve, and continue parallel to a given plane.