Definition of tranquillizer noun from the Oxford Advanced Learner's Dictionary

 

tranquillizer

 noun
(also -iser)(both British English)(North American English tranquilizer)noun
BrE BrE//ˈtræŋkwəlaɪzə(r)//
 
; NAmE NAmE//ˈtræŋkwəlaɪzər//
 
Medication
 
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a drug used to reduce anxiety She's on (= is taking) tranquillizers. See related entries: Medication