[fiend] n [ME, fr. OE fiend; akin to OHG fiant enemy, Skt piyati he scorns] (bef. 12c) 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 ~"
3: addict 1 "a dope ~"
4: wizard 3 "a ~ at mathematics"