Conoid

n. [Fr. conoïde, Gr. κωνοειδής, from κῶνος, cone, and εἶδος, form.]

1. Any thing that has a form resembling that of a cone.
2. (Geom.) (a.) A solid formed by the revolution of a conic section about its axis; as, a parabolic conoid, elliptic conoid, &c.;—more commonly called paraboloid, ellipsoid, &c. (b.) A warped surface which may be generated by a straight line moving in such a manner as to touch a straight line and curve, and continue parallel to a given plane. Math. Dict.