The Collaborative International Dictionary of English v.0.48:

Conoid \Co"noid\ a.
   Resembling a cone; conoidal.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Conoid \Co"noid\ (k[=o]"noid), n. [Gr. kwnoeidh`s conical;
   kw^nos cone + e'i^dos form: cf. F. cono["i]de.]
   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]

WordNet (r) 3.0 (2006):

conoid
    n 1: a shape whose base is a circle and whose sides taper up to
         a point [syn: cone, conoid, cone shape]