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English definition of “antihistamine”

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noun [C]  /ˌænt·iˈhɪs·təˌmin, ˌæn·tɑɪ-, -mən/ us  
a drug taken to limit the bad effect of the body’s reaction to some substances: I took an antihistamine for my runny nose.
(Definition of antihistamine from the Cambridge Academic Content Dictionary © Cambridge University Press)
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