Source : Webster's Revised Unabridged Dictionary (1913)

Trout \Trout\ (trout), n. [AS. truht, L. tructa, tructus; akin
   to Gr. trw`kths a sea fish with sharp teeth, fr. trw`gein to
   gnaw.]
   1. (Zo["o]l.) Any one of numerous species of fishes belonging
      to {Salmo}, {Salvelinus}, and allied genera of the family
      {Salmonid[ae]}. 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.

Source : WordNet®

trout
     n 1: flesh of any of several primarily freshwater game and food
          fishes
     2: any of various game and food fishes of cool fresh waters
        mostly smaller than typical salmons