Hy*pop"ti*lum (?), n.; pl. L. Hypoptila (#), E. Hypoptilums (#). [NL., fr. Gr. beneath + down.] 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 1913.

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