The Collaborative International Dictionary of English v.0.48:

Cone \Cone\ (k[=o]n?), n. [L. conus cone (in sense 1), Gr.
   kw^nos; akin to Skr. [,c]ana whetstone, L. cuneus wedge, and
   prob. to E. hone. See Hone, n.]
   1. (Geom.) A solid of the form described by the revolution of
      a right-angled triangle about one of the sides adjacent to
      the right angle; -- called also a right cone. More
      generally, any solid having a vertical point and bounded
      by a surface which is described by a straight line always
      passing through that vertical point; a solid having a
      circle for its base and tapering to a point or vertex.
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   2. Anything shaped more or less like a mathematical cone; as,
      a volcanic cone, a collection of scori[ae] around the
      crater of a volcano, usually heaped up in a conical form.
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            Now had Night measured with her shadowy cone
            Half way up hill this vast sublunar vault. --Milton.
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   3. (Bot.) The fruit or strobile of the Conifer[ae], as of
      the pine, fir, cedar, and cypress. It is composed of woody
      scales, each one of which has one or two seeds at its
      base.
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   4. (Zool.) A shell of the genus Conus, having a conical
      form.
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   Cone of rays (Opt.), the pencil of rays of light which
      proceed from a radiant point to a given surface, as that
      of a lens, or conversely.

   Cone pulley. See in the Vocabulary.

   Oblique cone or Scalene cone, a cone of which the axis is
      inclined to the plane of its base.

   Eight cone. See Cone, 1.
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