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Definition of class A drug noun from the Oxford Advanced Learner's Dictionary

class A drug

noun
 
/ˌklɑːs eɪ ˈdrʌɡ/
 
/ˌklæs eɪ ˈdrʌɡ/
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  1. any of various illegal drugs that are on a list of the strongest, most harmful drugs. There is a heavy punishment for anyone caught with these drugs or selling them. Class A drugs include heroin, cocaine and LSD.
trait
noun
 
 
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