\Conch\, n. [L. concha, Gr. ?. See {Coach}, n.]
1. (Zo["o]l.) A name applied to various marine univalve
   shells; esp. to those of the genus {Strombus}, which are
   of large size. {S. gigas} is the large pink West Indian
   conch. The large king, queen, and cameo conchs are of the
   genus {Cassis}. See {Cameo}.
Note: The conch is sometimes used as a horn or trumpet, as in
      fogs at sea, or to call laborers from work.
2. In works of art, the shell used by Tritons as a trumpet.
3. One of the white natives of the Bahama Islands or one of
   their descendants in the Florida Keys; -- so called from
   the commonness of the conch there, or because they use it
   for food.
4. (Arch.) See {Concha}, n.
5. The external ear. See {Concha}, n., 2.