Any mollusk belonging to or resembling the cowrie shell family (Cypraeidae).
From Cypraea plus the English suffix '-id' meaning member of a family. Standard zoological nomenclature for organisms related to the cowrie genus.
Cowries have an unusual defense: they can retract completely inside their shell, leaving only a smooth porcelain exterior—which is why cypraeids became the most perfectly polished shells known to humans!
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