‖Hy‐pop″ti‐lum (?), n.; pl. L. Hypoptila (#), E. Hypoptilums (#). [NL., fr. Gr. υπὅ beneath + � down.] (Zoöl.) 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.