a. [ L. perca a perch + -oid: cf. F. percoïde. ] (Zool.) Belonging to, or resembling, the perches, or family Percidæ. -- n. Any fish of the genus Perca, or allied genera of the family Percidæ; a percoidean. [ 1913 Webster ]
‖n. pl. [ NL. ] (Zool.) Same as Perciformes. [ 1913 Webster ]
n. Any of numerous spiny-finned fishes of the order Perciformes. Syn. -- percoid fish, percoid. [ WordNet 1.5 ]