Pronunciation: (trout),[key] —n., —pl.(esp. collectively)trout,(esp. referring to two or more kinds or species)trouts. 1. any of several game fishes of the genus Salmo, related to the salmon. Cf. brown trout, cutthroat trout, rainbow trout. 2. any of various game fishes of the salmon family of the genus Salvelinus. Cf. brook trout (def. 1), char2, Dolly Varden (def. 4), lake trout. 3. any of several unrelated fishes, as a bass, Micropterus salmoides, a drum of the genus Cynoscion, or a greenling of the genus Hexagrammos.