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plural underwings
A hind wing on an insect. quotations examples
The upper wings of the moth which Jacob held were undoubtedly marked with kidney-shaped spots of a fulvous hue. But there was no crescent upon the underwing.
1922 October 26, Virginia Woolf, chapter 2, in Jacob’s Room, Richmond, London: […] Leonard & Virginia Woolf at the Hogarth Press; republished London: The Hogarth Press, 1960,
A member of the genus Catocala, a nocturnal moth which usually has brightly coloured underwings. examples
(ornithology) The underside of a bird's wing.