archfiend (n.)youdaoicibaDictYouDict[archfiend 词源字典]
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]
[archfiend etymology, archfiend origin, 英语词源]