Hypoptilum

Hy`pop´ti`lum

(Zool.) 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.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

Mentioned in

Hyporadius
Hyporhachis

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