Webster's English Dictionary

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fiend

fiend \'fe-nd\ n [ME, fr. OE fi-end; akin to OHG fi-ant enemy] 1a: DEVIL  
   1b: DEMON  1c: a person of great wickedness or maliciousness  2: a person 
   excessively devoted to a pursuit or study : FANATIC  3: a person who uses 
   immoderate quantities of something : ADDICT  4: a person remarkably clever 
   at something