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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).

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).

Purgative anthraquinone found in several plants, especially Rhamnus frangula. It was formerly used as a laxative, but is now used mainly as tool in toxicity studies.

A crystalline body, C14H4 (CH3) (OH)3O2, found in rhubarb, senna, cascara sagrada, aloes, and other purgative drugs, but itself having but little cathartic action.

Tri-oxymethyl-anthraquinone, (C14H4) (CH3) (OH)3O2. The term emodin is used generically for isomeric, or identical, substances found in a number of purgative drugs, such as rhubarb, senna, and others. It is one of the active principles of the cathartic drugs.