The Collaborative International Dictionary of English v.0.48:

Wrasse \Wrasse\, n. [W. gwrachen.] (Zool.)
   Any one of numerous edible, marine, spiny-finned fishes of
   the genus Labrus, of which several species are found in the
   Mediterranean and on the Atlantic coast of Europe. Many of
   the species are bright-colored.
   [1913 Webster]

   Note: Among the European species are the ballan wrasse
         (Labrus maculatus), the streaked wrasse (Labrus
         lineatus), the red wrasse (Labrus mixtus), the
         comber wrasse (Labrus comber), the blue-striped, or
         cook, wrasse (see Peacock fish, under Peacock), the
         rainbow wrasse (Labrus vulgaris), and the seawife.
         [1913 Webster]

WordNet (r) 3.0 (2006):

wrasse
    n 1: chiefly tropical marine fishes with fleshy lips and
         powerful teeth; usually brightly colored