emodin

[Hindu Emodi, the specific name of Rheum emodi, one of the plants which furnish Indian Rhubarb; suff. -in ( Chem.) (q. v.).] Chem.: C15H10O5. A constituent of rhubarb root, extracted from it along with chrysophanic acid by benzine. Emodin is said to be a derivative from methyl anthracene, and to be tri oxy methyl-anthra quinone, C14H4 (CH3 (OH)3 (Watts: Dict. Ch., Sup. 3.)