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hypoptilum |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hypoptilum \Hy*pop"ti*lum\, n.; pl L. {Hypoptila}, E. {Hypoptilums}. [NL., fr Gr "ypo` beneath + ? down.] (Zo["o]l.) 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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