Definition of fin noun from the Oxford Advanced American Dictionary

     

    fin

     noun
    noun
    NAmE//fɪn//
     
     
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  1. 1a thin, flat part that sticks out from the body of a fish, used for swimming and maintaining balance
  2. 2a thin, flat part that sticks out from the body of a vehicle, an aircraft, etc., used for improving its balance and movement tail fins
See the Oxford Advanced Learner's Dictionary entry: fin

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