egg tooth

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

日本語の意味

(動物学) 孵化時に、卵の殻を破るために幼体が使用する、小さくて鋭い頭部の突起。

The hatchling used its egg tooth to pierce the shell and emerge into the sunlight.

ヒナは卵歯を使って殻を突き破り、太陽の光の下に出てきた。

意味（1）

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

egg teeth

（ plural ）