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English definition of “antihistamine”

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antihistamine

noun [C or U] uk   /ˌæn.tiˈhɪs.tə.mɪn/ /-miːn/ us    /-t̬i-/
a type of drug that is used to treat medical conditions caused by an extreme reaction to particular substances: Antihistamine is often used to treat hay fever and insect bites.
(Definition of antihistamine from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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