Definition of fin noun from the Oxford Advanced Learner's Dictionary

     

    fin

     noun
    noun
    BrE BrE//fɪn//
     
    ; NAmE NAmE//fɪn//
     
    Parts of a car, Parts of a plane, Parts of animals
     
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  1. 1 a thin flat part that sticks out from the body of a fish, used for swimming and keeping balance See related entries: Parts of animals
  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 related entries: Parts of a car, Parts of a plane
  3. Word Origin Old English finn, fin, of Germanic origin; related to Dutch vin and probably ultimately to Latin pinna ‘feather, wing’.
See the Oxford Advanced American Dictionary entry: fin

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