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Pronunciation varies by accent · noun
(malacology) The proteinaceous outer sheath of many molluscan shells..
Use periostracum when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Periostracum means (malacology) The proteinaceous outer sheath of many molluscan shells..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use periostracum where its definition matches the intended context.
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