Lexic.us

Definition of Periostracum

1. n. A chitinous membrane covering the exterior of many shells; -- called also epidermis.

Definition of Periostracum

1. Noun. (context: malacology) The proteinaceous outer sheath of many molluscan shells. ¹

¹ Source: wiktionary.com

Medical Definition of Periostracum

1. Origin: NL, fr. Gr. Around + shell of a testacean. A chitinous membrane covering the exterior of many shells. Synonym: epidermis. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Periostracum

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