Definition of reef noun from the Oxford Advanced American Dictionary

     

    reef

     noun
    noun
    NAmE//rif//
     
     
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  1. 1a long line of rocks or sand near the surface of the ocean a coral reef the Great Barrier Reef
  2. 2a part of a sail that can be tied or rolled up to make the sail smaller in a strong wind
See the Oxford Advanced Learner's Dictionary entry: reef

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