steelhead

[ steel-hed ]
/ ˈstilˌhɛd /

noun, plural steel·heads, (especially collectively) steel·head.

a silvery rainbow trout that migrates to the sea before returning to fresh water to spawn.

Origin of steelhead

First recorded in 1580–90; steel + head
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for steelhead

steelhead

/ (ˈstiːlˌhɛd) /

noun plural -heads or -head

a silvery North Pacific variety of the rainbow trout (Salmo gairdneri)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012