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



BrE BrE//ˈherəʊɪn//
; NAmE NAmE//ˈheroʊɪn//
[uncountable] Addiction
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a powerful illegal drug made from morphine, that some people take for pleasure and can become addicted to a heroin addict a fatal heroin overdose See related entries: Addiction Word Originlate 19th cent.: from German Heroin, from Latin heros ‘hero’ (because of its effects on the user's self-esteem).
See the Oxford Advanced American Dictionary entry: heroin