noun, plural (especially collectively) trout (especially referring to two or more kinds or species) trouts.
any of several game fishes of the genus Salmo, related to the salmon. Compare brown trout, cutthroat trout, rainbow trout.
any of various game fishes of the salmon family of the genus Salvelinus. Compare brook trout ( def 1 ), char2, Dolly Varden ( def 4 ), lake trout.
any of several unrelated fishes, as a bass, Micropterus salmoides, a drum of the genus Cynoscion, or a greenling of the genus Hexagrammos.

before 1050; Middle English trou(h)te, Old English truht < Latin tructa < Greek trṓktēs gnawer, a sea fish, equivalent to trṓg(ein) to gnaw + -tēs agent noun suffix

troutless, adjective
troutlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trout (traʊt)
n , pl trout, trouts
1.  any of various game fishes, esp Salmo trutta and related species, mostly of fresh water in northern regions: family Salmonidae (salmon). They resemble salmon but are smaller and spotted
2.  any of various similar or related fishes, such as a sea trout
3.  (Austral) any of various fishes of the Salmo or Oncorhynchus genera smaller than the salmon, esp European and American varieties naturalized in Australia
4.  informal (Brit) an irritating or grumpy person, esp a woman
[Old English trūht, from Late Latin tructa, from Greek troktēs sharp-toothed fish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. truht "trout," in part from O.Fr. truite, both from L.L. tructa, perhaps from Gk. troktes "a kind of sea fish," lit. "nibbler," from trogein "to gnaw," from PIE base *tere- (see throw). In late 17c. slang, trusty trout was used in a sense of "confidential friend."
Online Etymology Dictionary, © 2010 Douglas Harper
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