The Collaborative International Dictionary of English v.0.48:

Conus \Co"nus\ (k[=o]"n[u^]s), n. [L., a cone.]
   1. A cone.
      [1913 Webster]

   2. (Zool.) A Linnean genus of mollusks having a conical
      shell. See Cone, n., 4.
      [1913 Webster]