Saltwater shellfish with hard shells that live on rocks; sometimes they contain pearls inside.
From Old French 'huître,' derived from Latin 'ostrea,' from Greek 'ostreion.' The word traveled across Mediterranean languages as oyster-eating spread through trade.
Oysters were so common in ancient Greece that they used oyster shells as ballots for voting—they'd write names on them, and the word 'ostracism' (banishing someone by vote) literally comes from 'oyster shell'!
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