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egg tooth

n. (context zoology English) A small, sharp, cranial protuberance used by offspring to break or tear through the egg's surface during hatching.

Wikipedia
Egg tooth

In some egg-laying animals, the egg tooth is a small, sharp, cranial protuberance used by offspring to break or tear through the egg's surface during hatching. It is present in most reptiles, and similar structures exist in monotremes, Eleutherodactyl frogs, and spiders.

Some lizards develop a true tooth that is shed after use; other reptiles and birds generally develop an analogous epidermal horn that is reabsorbed or falls off.

Usage examples of "egg tooth".

He had never felt so brilliant, never since the day when he'd used the egg tooth at the end of his snout to break through the shell that separated him from the wider world.

She had cut her way out of the leathery shell with the egg tooth atop her snout.

She recalled cutting her way out of a leathery sack at birth by using her egg tooth, only to be attacked by one of her older siblings while still weary from the ordeal.