demoniac (adj.)youdaoicibaDictYouDict[demoniac 词源字典]
c. 1400, "possessed, insane," earlier (late 14c.) as a noun, "one who is possessed," from Late Latin daemoniacus, from Greek daimoniakos "possessed by a demon," from diamon (see demon).[demoniac etymology, demoniac origin, 英语词源]