Pĕr'i-ŏs'tra-eŭm, n.
n. [Gr. περί, around, and ὄστρα-κον, a shell.] (Zoöl.) A yellowish membrane investing many shells;—often erroneously called epiderm. Dana.
n. [Gr. περί, around, and ὄστρα-κον, a shell.] (Zoöl.) A yellowish membrane investing many shells;—often erroneously called epiderm. Dana.