Definition of "Sunfish" :

noun: small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies; black bass; bluegills; pumpkinseed

noun: among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters

noun: the lean flesh of any of numerous American perch-like fishes of the family Centrarchidae