Bible Dictionaries
Hypoptilum
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Hypoptilum'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/h/hypoptilum.html. 1828.