/ ˈɔɪstə(r); NAmE / noun
a large flat shellfish . Some types of oyster can be eaten and others produce shiny white jewels called pearls :
Oyster beds, on the mudflats, are a form of fish farming.
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IDIOMS
see world
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WORD ORIGIN
Middle English : from Old French oistre , via Latin from Greek ostreon ; related to osteon bone and ostrakon shell or tile.