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

 

barbiturate

 noun
noun
BrE BrE//bɑːˈbɪtʃʊrət//
 
; NAmE NAmE//bɑːrˈbɪtʃʊrət//
 
 
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a powerful drug that makes you feel calm and relaxed or puts you to sleep. There are several types of barbiturate. He died from an overdose of barbiturates.
See the Oxford Advanced American Dictionary entry: barbiturate