Definition of underwing
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
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First Known Use of underwing
1535
2
underwing
adjective
un·der·wing
Definition of underwing
: placed or growing underneath the wing underwing rockets
First Known Use of underwing
1896
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