Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The horny covering of the upper part of a bird's beak

from the GNU version of the Collaborative International Dictionary of English

  • n. The sheath of the upper mandible of a bird.

from The Century Dictionary and Cyclopedia

  • n. In ornithology, the integument of the upper mandible of a bird, exclusive of the dertrotheca.

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