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An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft. See Illust. of Feather.

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  1. n. An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft. See Illust. of Feather.
  2. An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft. See Illust. of Feather.
  3. An accessory plume arising from the posterior side of the stemof the contour feathers of many birds; -- called also aftershaft. SeeIllust. of Feather.
  4. hypoptilum (plural hypoptila) (ornithology) An aftershaft.