1 definition 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]
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