American English

Definition of oyster noun from the Oxford Advanced American Dictionary

 

oyster

 noun
noun
NAmE//ˈɔɪstər//
 
 
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  • a large flat shellfish. Some types of oysters can be eaten and others produce shiny white jewels called pearls. Oyster beds, on the mudflats, are a form of fish farming.
  • Idioms
    the world is your oyster
     
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    there is no limit to the opportunities open to you With talent like that, the world is her oyster.
    See the Oxford Advanced Learner's Dictionary entry: oyster