Cambridge Advanced Learner's Dictionary
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Definition
heroin noun
/ˈher.əʊ.ɪn/
/-oʊ-/ n [U]
/-oʊ-/ n [U] a powerful illegal drug
Heroin is obtained from morphine and is extremely addictive.
a heroin addict
She died from a heroin overdose.
(Definition of heroin noun from the Cambridge Advanced Learner's Dictionary)
