Mussel

from WordNet (r) 3.0 (2006)

mussel
    n 1: black marine bivalves usually steamed in wine
    2: marine or freshwater bivalve mollusk that lives attached to
       rocks etc.

from The Collaborative International Dictionary of English v.0.48

Mussel \Mus"sel\, n. [See {Muscle}, 3.]
   1. (Zool.) Any one of many species of marine bivalve shells
      of the genus {Mytilus}, and related genera, of the family
      {Mytidae}. The common mussel ({Mytilus edulis}; see
      Illust. under {Byssus}), and the larger, or horse, mussel
      ({Modiola modiolus}), inhabiting the shores both of Europe
      and America, are edible. The former is extensively used as
      food in Europe.
      [1913 Webster]

   2. (Zool.) Any one of numerous species of {Unio}, and related
      fresh-water genera; -- called also {river mussel}. See
      {Naiad}, and {Unio}.
      [1913 Webster]

   {Mussel digger} (Zool.), the grayback whale. See {Gray
      whale}, under {Gray}.
      [1913 Webster]