archfiend

英 [,ɑːtʃ'fiːnd] 美['ɑrtʃ'find]

archfiend (n.): 1667, from arch (adj.) + fiend (n.). Originally and typically Satan (arch-foe "Satan" is from 1610s).
So stretcht out huge in length the Arch-fiend lay. ["Paradise Lost," 1667]