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Definition of Periostracum
1. n. A chitinous membrane covering the exterior of many shells; -- called also epidermis.
Medical Definition of Periostracum
1.
Origin: NL, fr. Gr. Around + shell of a testacean.
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1. n. A chitinous membrane covering the exterior of many shells; -- called also epidermis.
1.
Origin: NL, fr. Gr. Around + shell of a testacean.