外がい殻かく

noun

outer shell; crust

Refers to the hard outer covering of something, such as an egg, nut, crustacean, or the earth's crust. Often used in scientific or descriptive contexts.

• 卵たまごの外がい殻かくを割わる。

  Crack the outer shell of the egg.

• 地ち球きゅうの外がい殻かくは地ち殻かくと呼よばれる。

  The Earth's outer shell is called the crust.