'Hypoptilum' definitions:

Definition of 'Hypoptilum'

From: 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]

Words containing 'Hypoptilum'