"Hypoptilums" is a word in ENGLISH

hypoptilums ENGLISH
Definition:

of Hypoptilum

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aftershaft ENGLISH
hypoptila ENGLISH
hypoptilum ENGLISH

An accessory plume arising from the posterior side of the stem of the contour feathers of many birds; -- called …

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hyporadius ENGLISH

One of the barbs of the hypoptilum, or aftershaft of a feather. See Feather.

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hyporhachis ENGLISH

The stem of an aftershaft or hypoptilum.

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