Salmo gairdneri

from WordNet (r) 3.0 (2006)

Salmo gairdneri
    n 1: found in Pacific coastal waters and streams from lower
         California to Alaska [syn: {rainbow trout}, {Salmo
         gairdneri}]

from The Collaborative International Dictionary of English v.0.48

Steelhead \Steel"head`\ (-h[e^]d`), n.
   1. (Zool.) A North Pacific salmon ({Salmo Gairdneri}) found
      from Northern California to Siberia; -- called also
      {hardhead}, and {preestl}.
      [1913 Webster]

   2. (Zool.) The ruddy duck.
      [1913 Webster]