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English definition of “methamphetamine”

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noun [U] uk   /ˌmeθ.æmˈfet.ə.miːn/ us    /-fet̬-/ ( also slang crystal meth, meth )
a drug that makes your mind and body more active. It is addictive (= you cannot stop taking it when you have started) and some people take it illegally.
(Definition of methamphetamine from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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