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



    BrE BrE//fiːnd//
    ; NAmE NAmE//fiːnd//
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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 fiend
  3. 3an evil spirit
  4. Word OriginOld English fēond ‘an enemy, the devil, a demon’, of Germanic origin; related to Dutch vijand and German Feind ‘enemy’.
See the Oxford Advanced American Dictionary entry: fiend