antihistamine
noun [ C or U ] uk/ˌæn.tiˈhɪs.tə.mɪn/ /ˌæn.tiˈhɪs.tə.miːn/ us/ˌæn.t̬iˈhɪs.tə.mɪn/ /ˌæn.t̬iˈhɪs.tə.miːn/
（治疗过敏症的）抗组（织）胺剂，抗组（织）胺药
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. 抗组胺药常用于治疗枯草热以及昆虫叮咬。