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periostracum

[per-ee-os-truh-kuh m] /ˌpɛr iˈɒs trə kəm/
noun, plural periostraca
[per-ee-os-truh-kuh] /ˌpɛr iˈɒs trə kə/ (Show IPA)
1.
the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
Origin
1830-1840
1830-40; < Neo-Latin, equivalent to peri- peri- + ostracum a shell < Greek óstrakon. See oyster
Related forms
periostracal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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