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  • Webster's Revised Unabridged Dictionary
    • n Periostracum (Zoöl) A chitinous membrane covering the exterior of many shells; -- called also epidermis.
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Century Dictionary and Cyclopedia
    • n periostracum The horny epidermal investment of the shells of most mollusks.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. around + shell of a testacean