[ per-ee-os-truh-kuhm ]
/ ˌpɛr iˈɒs trə kəm /
noun, plural per·i·os·tra·ca [per-ee-os-truh-kuh]. /ˌpɛr iˈɒs trə kə/.
the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
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Origin of periostracum
OTHER WORDS FROM periostracumper·i·os·tra·cal, adjective
Words nearby periostracum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020