oyster
oys·ter [oyster oysters] BrE [ˈɔɪstə(r)] NAmE [ˈɔɪstər] 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.
see the world is your oyster at ↑world
Word Origin:
Middle English: from Old French oistre, via Latin from Greek ostreon; related to osteon ‘bone’ and ostrakon ‘shell or tile’.
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