Bit·ter·root n. Bot. 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 Spæt'lum.

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 Lewisia rediviva
      n : showy succulent ground-hugging plant of Rocky Mountains
          regions having deep to pale pink flowers and fleshy
          farinaceous roots; the Montana state flower [syn: bitterroot]