underwing

[ uhn-der-wing ]
/ ˈʌn dərˌwɪŋ /

noun

one of the hind wings of an insect.
any of several noctuid moths of the genus Catocala, characterized by red-, yellow-, or orange-banded hind wings.

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Origin of underwing

First recorded in 1525–35; under- + wing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for underwing

underwing
/ (ˈʌndəˌwɪŋ) /

noun

the hind wing of an insect, esp when covered by the forewing
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