Definition of fiend noun from the Oxford Advanced American Dictionary

     

    fiend

     noun
    noun
    NAmE//find//
     
     
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  1. 1a very cruel or unpleasant person
  2. 2 (informal) (used after another noun) a person who is very interested in the thing mentioned synonym fanatic a crossword puzzle fiend
  3. 3an evil spirit
See the Oxford Advanced Learner's Dictionary entry: fiend