valerian

1. A hardy perennial flowering plant, Valeriana officinalis, with heads of sweetly scented pink or white flowers. (countable, uncountable)
2. More generally, any plant of the genus Valeriana. (countable, uncountable)
3. The root of Valeriana officinalis, used in herbal medicine. (uncountable)
4. An extract of the dried roots of the Valeriana officinalis used in herbal medicine as a sedative. (countable, uncountable)

Plural valerians