heroin
Pronunciation: /ˈhɛrəʊɪn/
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Definition of heroin
noun
Origin:
late 19th century: from German Heroin, from Latin heros 'hero' (because of its effects on the user's self-esteem)
Do not confuse heroin with heroine. Heroin is an illegal drug, whereas a heroine is the main female character in a film, play, or book, or a woman who is admired for her achievements (she was a true feminist heroine).