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English definition of “drug”

drug

noun [C]
 
 
/drʌɡ/
ILLEGAL SUBSTANCE B2 an illegal substance that people take to make them feel happy: [usually plural] He started taking/using drugs such as heroin and cocaine. Greg is on drugs (= he uses drugs regularly). a drug dealer Drugs - general wordsSpecific types of drug
MEDICINE B2 a chemical substance used as a medicine: Scientists are developing a new drug to treat cancer. → See also hard drugsMedicine in different formsDrugs - general wordsSpecific types of drug
(Definition of drug noun from the Cambridge Learners Dictionary © Cambridge University Press)
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