Definition of roar noun from the Oxford Advanced American Dictionary

     

    roar

     noun
    noun
    NAmE//rɔr//
     
     
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  1. 1a loud deep sound made by an animal, especially a lion, or by someone's voice His speech was greeted by a roar of applause. roars of laughter
  2. 2a loud continuous noise made by the wind or ocean, or by a machine I could barely hear above the roar of traffic. the roar of the Atlantic
See the Oxford Advanced Learner's Dictionary entry: roar