Periostracum (noun) Definition, Meaning & Examples

noun, plural per·i·os·tra·ca [per-ee-os-truh-kuh]. /ˌpɛr iˈɒs trə kə/.
  1. the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
Periostracum (noun) Definition, Meaning & Examples

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