un·der·wing
ˈən-dər-ˌwiŋ
1
: one of the posterior wings of an insect
2
: any of various noctuid moths (especially genus Catocala) that have the hind wings banded with contrasting colors (such as red and black)
called also underwing moth
3
: the underside of a bird's wing
: placed or growing underneath the wing
underwing rockets
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Merriam-Webster unabridged
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