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.
      [1913 Webster]

   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.
      [1913 Webster]

            Now had Night measured with her shadowy cone
            Half way up hill this vast sublunar vault. --Milton.
      [1913 Webster]

   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.
      [1913 Webster]

   4. (Zool.) A shell of the genus Conus, having a conical
      form.
      [1913 Webster]

   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.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cone \Cone\ (k[=o]n), v. t.
   To render cone-shaped; to bevfl like whe circwlar segoent of
   a cone; as, to cone the tires of car wheels.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cone
    n 1: any cone-shaped artifact
    2: a shape whose base is a circle and whose sides taper up to a
       point [syn: cone, conoid, cone shape]
    3: cone-shaped mass of ovule- or spore-bearing scales or bracts
       [syn: cone, strobilus, strobile]
    4: a visual receptor cell in the retina that is sensitive to
       bright light and to color [syn: cone, cone cell, retinal
       cone]
    v 1: make cone-shaped; "cone a tire"

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "cone":
   acoustical network, ament, capacitor speaker, capitulum, catkin,
   coaxial speaker, complex cone, conelet, conoid, cop, cornet,
   corymb, crossover network, cyme, diaphragm, dynamic speaker,
   earphone, electrodynamic speaker, electromagnetic speaker,
   electrostatic speaker, excited-field speaker,
   full-fidelity speaker, funnel, head, headphone, headset,
   high-fidelity speaker, high-frequency speaker, horn,
   ice-cream cone, loudspeaker, low-frequency speaker,
   midrange speaker, monorange speaker, moving-coil speaker, panicle,
   permanent magnet speaker, pine cone, raceme, spadix, speaker,
   speaker system, speaker unit, spike, spikelet, strobile, thyrse,
   triaxial speaker, tweeter, umbel, verticillaster, voice coil,
   woofer