Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The anadromous form of the rainbow trout, having silvery sides usually with a light red band.

from The Century Dictionary.

  • noun The ruddy duck, Erismatura rubida: so called from the steel-blue of the head, or perhaps for the same reason that it is called hardhead, hickory-head, and toughhead. See cut under Erismatura.
  • noun The rainbow-trout, Salmo irideus. See cut under rainbow-trout.
  • Tipped with steel.
  • noun A large trout, Salmo rivularis, of the Pacific coast of the United States.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) A North Pacific salmon (Salmo Gairdneri) found from Northern California to Siberia; -- called also hardhead, and preestl.
  • noun (Zoöl.) The ruddy duck.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The anadromous form of the rainbow trout, Oncorhynchus mykiss
  • noun The ruddy duck.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

steel +‎ head

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