from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The horny covering of the lower part of a bird's beak.
from the GNU version of the Collaborative International Dictionary of English
- n. The horney covering of the lower mandible of a bird.
from The Century Dictionary and Cyclopedia
- n. In ornith., the integument of the gnathidium; the horny or leathery investment of the under mandible.
Ancient Greek γνάθος ("jaw") + θήκη ("sheath") (Wiktionary)
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