The Collaborative International Dictionary of English v.0.48:

Pompano \Pom"pa*no\, n. [Sp. p['a]mpano.] [Written also
   pampano.] (Zool.)
   1. Any one of several species of marine fishes of the genus
      Trachynotus, of which four species are found on the
      Atlantic coast of the United States; -- called also
      palometa.
      [1913 Webster]

   Note: They have a brilliant silvery or golden luster, and are
         highly esteemed as food fishes. The round pompano
         (Trachynotus thomboides) and the Carolina pompano
         (Trachynotus Carolinus) are the most common. Other
         species occur on the Pacific coast.
         [1913 Webster]

   2. A California harvest fish (Stromateus simillimus),
      highly valued as a food fish.
      [1913 Webster]

   Pompano shell (Zool.), a small bivalve shell of the genus
      Donax; -- so called because eaten by the pompano.
      [Florida]
      [1913 Webster]