Century Dictionary and Cyclopedia
- n. In ornithology: A supplementary feather growing out of a feather; the hypoptilum.
- n. The shaft of such a supplementary feather. Also called hyporachis.
GNU Webster's 1913
- n. (Zoöl.) The hypoptilum.
- 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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