Rēd'-rōot, n.

n. (Bot.) A plant of several different genera having red roots; as, (a.) A plant of the genus Ceanothus (C. Americanus), the leaves of which were formerly sometimes used as a substitute for tea; New Jersey tea. (b.) A plant of the genus Lithospermum (L. arvense); stone-weed. (c.) A plant of the genus Lachnanthes (L. tinctoria).

The name is also sometimes applied to the blood-root, or Sanguinaria Canadensis.