(n.) A plant (Lewisia rediviva) allied to the purslane, but with fleshy, farinaceous roots, growing in the mountains of Idaho, Montana, etc. It gives the name to the Bitter Root mountains and river. The Indians call both the plant and the river Spaet'lum.
BITTERROOT
Meaning of BITTERROOT in English
Webster's English dictionary. Английский словарь Webster. 2012