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[per-ee-os-truh-kuh m] /ˌpɛr iˈɒs trə kəm/

noun, plural periostraca
[per-ee-os-truh-kuh] /ˌpɛr iˈɒs trə kə/ (Show IPA)
the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.


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