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

 

valerian

 noun
noun
BrE BrE//ˈlɪəriən//
 
; NAmE NAmE//ˈlɪriən//
 
[uncountable]
 
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a drug obtained from the root of a plant with the same name, used to make people feel calmer Word Origin late Middle English: from Old French valeriane, from medieval Latin valeriana (herba), apparently the feminine of Valerianus ‘of Valerius’ (a personal name).
See the Oxford Advanced American Dictionary entry: valerian