valerian
noun /vəˈlɪəriən/
/vəˈlɪriən/
[uncountable]- a drug obtained from the root of a plant with the same name, used to make people feel calmer
缬草根（从缬草根提取的镇定药） 词源late Middle English: from Old French valeriane, from medieval Latin valeriana (herba), apparently the feminine of Valerianus ‘of Valerius’ (a personal name).