[ per-ee-os-truh-kuhm ]
/ ˌpɛr iˈɒs trə kəm /
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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.
QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
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. 2021