opiate (n.)youdaoicibaDictYouDict[opiate 词源字典]
"medicine containing opium," early 15c., from Medieval Latin opiatus, from Latin opium (see opium). Figurative sense of "anything that dulls the feelings" is from 1640s. From 1540s in English as an adjective, "made with or containing opium."[opiate etymology, opiate origin, 英语词源]