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The root of several species of Rheum, used much as a cathartic medicine. Monk's rhubarb. (Bot.) See under Monk. -- Turkey rhubarb (Med.), the roots of Rheum Emodi.

Like rhubarb.

A glucoside extracted from rhubarb as a bitter, yellow, crystalline powder, and yielding chrysophanic acid on decomposition.

ng, chrysophane. Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin, etc.

An orange-red crystalline substance, C15H10O5, obtained from the buckthorn, rhubarb, etc., and regarded as a derivative of anthraquinone; -- so called from a species of rhubarb (Rheum emodei).

the Black Sea, the Mediterranean Sea, and the adjacent parts of the Atlantic. -- Monk's rhubarb (Bot.), a kind of dock; -- also called patience (Rumex Patientia).

Provided with ochrea, or sheathformed stipules, as the rhubarb, yellow dock, and knotgrass.

A kind of dock (Rumex Patientia), less common in America than in Europe; monk's rhubarb.

um Rhaponticum) the leafstalks of which are acid, and are used in making pies; the garden rhubarb.

ies of Polygonum) are the type, and which includes also the docks (Rumex), the buckwheat, rhubarb, sea grape (Coccoloba), and several other genera.

Impregnated or tinctured with rhubarb. Floyer.

Pertaining to, or designating, an acid (commonly called chrysophanic acid) found in rhubarb (Rheum). [Obsoles.]

A genus of plants. See Rhubarb.