/ fiːnd; NAmE / noun
1.
a very cruel or unpleasant person
2.
( informal ) (used after another noun) a person who is very interested in the thing mentioned
SYN fanatic :
a crossword fiend
3.
an evil spirit
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WORD ORIGIN
Old English fēond an enemy, the devil, a demon , of Germanic origin; related to Dutch vijand and German Feind enemy.