Definition of egg tooth in English:

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egg tooth

noun

A hard white protuberance on the beak or jaw of an embryo bird or reptile that is used for breaking out of the shell and is later lost.
Example sentences
  • It all started nearly 50 days ago when I poked my egg tooth out of my shell.
  • That's an egg tooth that it used to cut its way out of its shell in just the same way as reptiles and birds do.
  • It's also lacking an egg tooth, but it's got regular teeth in its beak - as well as a long bony tail that make it look rather different from modern birds.
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