Conoid (kōnoid), n. [Gr. kwnoeidhs conical; kw^nos cone + e'i^dos form: cf. F. conoïde.] 1. Anything that has a form resembling that of a cone.
[1913 Webster]

2. (Geom.) (a) 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. (b) 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. Math. Dict.
[1913 Webster]