Definition of demon noun from the Oxford Advanced American Dictionary

     

    demon

     noun
    noun
    NAmE//ˈdimən//
     
     
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  1. 1an evil spirit demons torturing the sinners in Hell
  2. 2(informal) a person who does something very well or with a lot of energy He skis like a demon. He's a demon: he gets up early, he works out, he goes home early, he studies, he works out again…
  3. 3something that causes a person to worry and makes them unhappy the demons of jealousy
See the Oxford Advanced Learner's Dictionary entry: demon