Underwing meaning

ŭndər-wĭng
One of a pair of hind wings of an insect, especially a moth or butterfly.
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Any of various noctuid moths chiefly of the genus Calocala, having drab forewings and brightly colored hind wings that are not visible when the moth is at rest.
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The underside of a wing, as of a bird or airplane.
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Either of the pair of hind wings of an insect.
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Any of various noctuid moths (esp. genus Catocala) having brightly colored hind wings that are hidden under drab forewings except during flight.
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A hind wing on an insect.
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A member of the genus Catocala, a nocturnal moth which usually has brightly coloured underwings.
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(ornithology) The underside of a bird's wing.
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Origin of underwing