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



BrE BrE//ˈlɪəriən//
; NAmE NAmE//ˈlɪriən//
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a drug obtained from the root of a plant with the same name, used to make people feel calmer Word Originlate 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