[L. Rha, Volga; barbarus, foreign.] A plant (Rheum rhaponticum) brought from the banks of the Volga, the stalks of which are used as food. The stalk is large and fleshy, and very juicy ; the blade is broad, with large veins running from the foot-stalk. The stalk and veins are smooth, and covered with a fine thin skin easily removable when the leaf is young. It is used as a substitute for fiuit in pies and tarts, and the juice is pressed into wine. Rhubard of medicine is the dried root of a wild plant (Rheum officinale) now chieflv brought from China and Tibet.