Source : Webster's Revised Unabridged Dictionary (1913)

Conoid \Co"noid\, n. [Gr. ? conical; ? cone + ? from: cf. F.
   cono["i]de.]
   1. Anything 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, 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.

Conoid \Co"noid\ a.
   Resembling a cone; conoidal.

Source : WordNet®

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