- An aftershaft.
- An accessory plume due to the posterior side of the stem associated with contour feathers of many wild birds; -- called in addition aftershaft. See Illust. of feather.
- In ornithology, the aftershaft or hyporachis of a feather; the full supplementary plume which springs through the stem of the primary feather at the junction of calamus and rachis.
Variant for "hypoptilum"
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