01 n. An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called also aftershaft. See Illust…
pl.
Hypoptila, Hypoptilums ((#))
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1.
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.(Zool.) Also: aftershaft See: Feather