Definition of opiate noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈəʊpiət//
; NAmE NAmE//ˈoʊpiət//
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a drug derived from opium. Opiates are used in medicine to reduce severe pain. Word Originlate Middle English (as a noun): from medieval Latin opiatus (adjective), opiatus (noun), based on Latin opium, from Greek opion ‘poppy juice’, from opos ‘juice’, from an Indo-European root meaning ‘water’.
See the Oxford Advanced American Dictionary entry: opiate