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Line breaks: her¦oin
Pronunciation: /ˈhɛrəʊɪn

Definition of heroin in English:


[mass noun]
A highly addictive analgesic drug derived from morphine, often used illicitly as a narcotic producing euphoria.
Example sentences
  • Any person trying heroin or any addictive drug for the first time knows that it can hook you.
  • Caffeine is addictive and hooks you in the same way as amphetamines, cocaine and heroin.
  • Yes, the use of heroin and harder drugs has also risen steadily there over a similar period.


late 19th century: from German Heroin, from Latin heros 'hero' (because of its effects on the user's self-esteem).

Definition of heroin in:

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a short excursion or journey made for pleasure