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Meaning of lousewort

louse•wort

Pronunciation: (lous'wûrt", -wôrt"), [key]
— n.
  1. any plant belonging to the genus Pedicularis, of the figwort family, as the wood betony, formerly supposed to cause lice in sheep feeding on it: one species, P. furbishiaeof parts of Maine and New Brunswick, Canada, having finely toothed leaves and a cluster of yellow flowers, is endangered and was thought to be extinct until specimens were discovered in 1946 and again in 1976.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.