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



    BrE BrE//rɔː(r)//
    ; NAmE NAmE//rɔːr//
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  1. 1a loud deep sound made by an animal, especially a lion, or by somebody’s voice His speech was greeted by a roar of applause. roars of laughter
  2. 2a loud continuous noise made by the wind or sea, or by a machine I could barely hear above the roar of traffic. the roar of the Atlantic
  3. Word OriginOld English rārian (verb), imitative of a deep prolonged cry, of West Germanic origin; related to German röhren. The noun dates from late Middle English.Extra examples A mighty roar went up from the crowd as the home team scored. She couldn’t make herself heard over the roar of the engines. The car sped off with an almighty roar. The lion let out a great roar. The low rumble had become a roar. The shouting grew into an angry roar. The sound of a distant roar echoed over the plains. There was a crash and a roar from the kitchen. a roar of applause/​laughter the distant roar of the sea the throaty roar of the engine I could barely hear above/​over the roar of the aircraft’s engines. The crowd burst into roars of laughter.
See the Oxford Advanced American Dictionary entry: roar