emodin

(em’o-din) [from Rhe’um em'odi, a Him a lay an rhubarb]. 1. A purgative resin, C,,HyO:, irom rhubarb and the buckthorn, 2. Any one of a series of principles isomeric with the emodin of rhubarb. aloe-e., a variety of emodin found in Socotrine, Barbados, and Zanzibar alocs, but not in Natal aloes.