a powerful illegal drug that people usually take by injecting it (=using a needle). Heroin is very addictive (=it is very difficult to stop taking it).
Synonyms and related words
Illegal drugs and drugs sometimes taken illegally
acid
anabolic steroid
cannabis
heroin
noun uncountable
US /ˈheroʊɪn/
Other entries for this word
heroin at soft drug
DEFINITIONS1
1
a powerful illegal drug that people usually take by injecting it (=using a needle). Heroin is very addictive (=it is very difficult to stop taking it).