nPercomorphione of the largest natural groups of fishes of both marine and fresh water: true perches; basses; tuna
Webster's Revised Unabridged Dictionary
n. plPercomorphi(Zoöl) A division of fishes including the perches and related kinds.
Century Dictionary and Cyclopedia
percomorphiIn. Cope's ichthyological system (1870), an order of physoclistous fishes, with the ventral fins thoracic or jugular, skull normal, bones of jaws distinct, and inferior pharyngeals separate. It thus includes most a canthopterygian fishes.