underwing

[uhn-der-wing]
noun
1.
one of the hind wings of an insect.
2.
any of several noctuid moths of the genus Catocala, characterized by red-, yellow-, or orange-banded hind wings.

Origin:
1525–35; under- + wing

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World English Dictionary
underwing (ˈʌndəˌwɪŋ)
 
n
1.  the hind wing of an insect, esp when covered by the forewing
2.  red underwing See yellow underwing

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The flight feathers and underwing linings are golden yellow.
Underwing coverts are variably streaked, as is the belly.
Immature bald eagles show a whiteline on the underwing coverts.
Underwing moths have erratic zigzag lines on the wings and are larger.
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