Rainbow trout Meaning, Definition & Usage

  1. noun flesh of Pacific trout that migrate from salt to fresh water
  2. noun found in Pacific coastal waters and streams from lower California to Alaska
    Salmo gairdneri.

WordNet

Definitions
  1. (Zoöl.), a bright-colored trout (Salmoirideus), native of the mountains of California, but now extensively introduced into the Eastern States. Japan, and other countries; called also brook trout, mountain trout, and golden trout.

Webster 1913