from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hard toothlike projection from the beak of embryonic birds, or from the upper jaw of embryonic reptiles, that is used to cut the egg membrane and shell upon hatching and that later falls off.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small, sharp, cranial protuberance used by offspring to break or tear through the egg's surface during hatching.
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