Any one of numerous species of fishes belonging to Salmo, Salvelinus, and allied genera of the family Salmonidæ. They are highly esteemed as game fishes and for the quality of their flesh. All the species breed in fresh water, but after spawning many of them descend to the sea if they have an opportunity.
- Any of various freshwater or anadromous food and game fishes of the family Salmonidae, especially of the genera Salmo and Salvelinus, usually having a streamlined, speckled body with small scales.
- Any of various similar but unrelated fishes, such as the troutperch.
- Chiefly British An elderly woman regarded as being silly.