periostracum

n. (软体动物介壳的) 角质层

词形变化

periostraca 复数 periostraca

释义与例句

n.
  1. 1.

    The proteinaceous outer sheath of many molluscan shells.

    生物

词源

Literally "surrounding shell", from peri- + ostracum.

来源：wiktionary