emodin
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em·o·din
(em'ō-din),A catharitc found in crystalline form in rhubarb, senna, cascara sagrada, and other purgative drugs.
emodin
(ĕm′ə-dĭn′)n.
An orange crystalline compound, C15H10O5, that is obtained from rhubarb and other plants and has cathartic, anti-inflammatory, and anticancer properties.