Source : Webster's Revised Unabridged Dictionary (1913)

Percomorphi \Per`co*mor"phi\, n. pl. [NL., fr. L. perca perch +
   Gr. ? form.] (Zo["o]l.)
   A division of fishes including the perches and related kinds.

Source : WordNet®

Percomorphi
     n : one of the largest natural groups of fishes of both marine
         and fresh water: true perches; basses; tuna [syn: {Perciformes},
          {order Perciformes}, {order Percomorphi}]