noun, plural periostraca [per-ee-os-truh-kuh] .
the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.

1830–40; < Neo-Latin, equivalent to peri- peri- + ostracum a shell < Greek óstrakon. See oyster

periostracal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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