Set·wall n. Bot. A plant formerly valued for its restorative qualities (Valeriana officinalis, or Valeriana Pyrenaica). [Obs.] [Written also setwal.]
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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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Valeriana officinalis
n : tall rhizomatous plant having very fragrant flowers and
rhizomes used medicinally [syn: common valerian, garden
heliotrope]