noun, plural vireos.
any of several small, insectivorous American birds of the family Vireonidae, having the plumage usually olive-green or gray above and white or yellow below.

1825–35; < Neo-Latin; Latin vireō (Pliny), probably the greenfinch, derivative of virēre to be green Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vireo (ˈvɪrɪəʊ)
n , pl vireos
any insectivorous American songbird of the family Vireonidae, esp those of the genus Vireo, having an olive-grey back with pale underparts
[C19: from Latin: a bird, probably a greenfinch; compare virēre to be green]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1834, from L. vireo, a word Pliny uses for some kind of bird, perhaps the greenfinch, from virere "be green" (see verdure). Applied in modern times to an Amer. bird.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Canopy birds soar overhead and include the scarlet tanager and red-eyed vireo.
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