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Medical Definition of Oncorhynchus mykiss
1. A large stout-bodied, sometimes anadromous, trout found in still and flowing waters of the pacific coast from southern california to alaska. It has a greenish back, a whitish belly, and pink, red, or lavender stripes on the sides, with usually a sprinkling of black dots. It is highly regarded as a sport and food fish. Its former name was salmo gairdneri. The sea-run rainbow trouts are often called steelheads. Redband trouts refer to interior populations of rainbows. (12 Dec 1998)