真しん珠じゅ層そう

noun

mother-of-pearl; nacreous layer

Refers to the iridescent inner layer of a mollusk shell, often used in jewelry and decorative arts.

• 真しん珠じゅ層そうは貝かい殻がらの内うち側がわにある美うつくしい層そうです。

  The mother-of-pearl layer is the beautiful layer inside the shell.