Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: feond 'enemy'

fiend

 noun
     
Related topics: Occult
fiend [countable]
1 a very cruel, evil, or violent person:
a heartless fiend
Both of them were fighting like fiends.
a sex/rape fiend (=one who commits very unpleasant sex attacks)
2

television/sports/fresh-air etc fiend

someone who likes watching television, doing sports etc a lot, or more than is normal [= fanatic]
3

drug/dope/cocaine etc fiend

someone who takes a lot of illegal drugs
4RO an evil spirit
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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