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Definition of opium noun from the Oxford Advanced American Dictionary

 

opium

 noun
noun
NAmE//ˈoʊpiəm//
 
[uncountable]
 
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a powerful drug made from the juice of a type of poppy (= a kind of flower), used in the past in medicines to reduce pain and help people sleep. Some people take opium illegally for pleasure and can become addicted to it. opium poppies the opium trade
See the Oxford Advanced Learner's Dictionary entry: opium