Main Entry: fiend

Pronunciation: \ˈfēnd\

Function: noun

Etymology: Middle English, from Old English fīend; akin to Old High German fīant enemy, Sanskrit pīyati he reviles, blames

Date: before 12th century

1 a : devil 1 b : demon c : a person of great wickedness or maliciousness
2 : a person extremely devoted to a pursuit or study : fanatic <a golf fiend>
3 : addict 1 <a dope fiend>
4 : wizard 3 <a fiend at mathematics>