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oyster

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oyster
oyster /ˈɔɪstə $ -ər/ noun [countable]
 Date: 1300-1400
 Language: Old French
 Origin: oistre, from Latin, from Greek ostreon

1. a type of shellfish that can be eaten cooked or uncooked, and that produces a jewel called a pearl
2. the world is your oyster used to tell someone that they can achieve whatever they want