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English definition of “tranquillizer”

tranquillizer

noun [C] (US usually tranquilizer, UK usually tranquilliser)     /ˈtræŋ.kwɪ.laɪ.zər/ US  /ˈtræn.kwɪ.laɪ.zɚ/
a drug used to make a person or animal calmer: She was on tranquillizers for a long time after her son died.Specific medicines and drugsSpecific types of drug
(Definition of tranquillizer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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