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periostracal

 - 1 dictionary result

per⋅i⋅os⋅tra⋅cum

  [per-ee-os-truh-kuhm]
Use periostracal in a Sentence
–noun, plural -ca  [-kuh] .
the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
Origin:
1830–40; < NL, equiv. to peri- peri- + ostracum a shell < Gk óstrakon. See oyster

Related forms:
per⋅i⋅os⋅tra⋅cal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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