Source : Webster's Revised Unabridged Dictionary (1913)

Percoid \Per"coid\, a. [L. perca a perch + -oid: cf. F.
   perco["i]de.] (Zo["o]l.)
   Belonging to, or resembling, the perches, or family
   {Percid[ae]}. -- n. Any fish of the genus {Perca}, or allied
   genera of the family {Percid[ae]}.

Source : WordNet®

percoid
     n : any of numerous spiny-finned fishes of the order Perciformes
         [syn: {percoid fish}, {percoidean}]