3 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Hypoptilum \Hy*pop"ti*lum\, n.; pl. L. {Hypoptila}, E. {Hypoptilums}. [NL., fr. Gr. "ypo` 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}. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Aftershaft \Aft"er*shaft`\, n. (Zool.) The {hypoptilum}. [1913 Webster] From WordNet (r) 2.0 [wn]: aftershaft n : a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds
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