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| un·der·wing [ úndər wìng ] (plural un·der·wings) |
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1. hind wing of insect: a hind wing of an insect such as a beetle, especially when covered by a forewing while the insect is not in flight
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2. moth with bright wings: a moth that has brightly colored hind wings that become visible only in flight. Genus Catocala.
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3. lower side of bird's wing: the underside of a bird's wing
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