underwing

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English[edit]

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Etymology[edit]

under +‎ wing

Noun[edit]

underwing (plural underwings)

  1. A hind wing on an insect.
    • 1922, Virginia Woolf, Jacob's Room Chapter 2
      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.
  2. A member of the genus Catocala, a nocturnal moth which usually has brightly coloured underwings.
  3. (ornithology) The underside of a bird's wing.