Va·le·ri·an n. Bot. Any plant of the genus Valeriana. The root of the officinal valerian (Valeriana officinalis) has a strong smell, and is much used in medicine as an antispasmodic.
Greek valerian Bot., a plant (Polemonium caeruleum) with blue or white flowers, and leaves resembling those of the officinal valerian.
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Polemonium caeruleum
n : pinnate-leaved European perennial having bright blue or
white flowers [syn: Jacob's ladder, Greek valerian, charity,
Polemonium van-bruntiae, Polymonium caeruleum
van-bruntiae]