
 Emodin (from Rheum emodi, a Himalayan rhubarb) is a purgative resin, 6-methyl-1,3,8-trihydroxyanthraquinone, from rhubarb, buckthorn and Japanese knotweed (Fallopia japonica syn. Polygonum cuspidatum). It is also produced by many species of fungi, including members of the genera Aspergillus, Pyrenochaeta, and Pestalotiopsis, inter alia. == Pharmac...
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http://en.wikipedia.org/wiki/Emodin

• (n.) 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).
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http://thinkexist.com/dictionary/meaning/emodin/

A substance found in certain plants, including rhubarb. It belongs to a family of compounds called anthraquinones, which have shown anti-inflammatory and anticancer effects.
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http://www.cancer.gov/dictionary?expand=E
 Em'o·din  noun  (Chemistry)
Em'o·din  noun  (Chemistry) An orange-red crystalline substance, C
 15 H
 10 O
 5 , obtained from the buckthorn, rhubarb, etc., and regarded as a derivative of anthraquinone; -- so called from a species of rhubarb (
 Rheum emodei ). 
Found on 
http://www.encyclo.co.uk/webster/E/29

Type: Term Pronunciation: em′ō-din Definitions: 1. A catharitc found in crystalline form in rhubarb, senna, cascara sagrada, and other purgative drugs. Synonyms: 1, 3, 8-trihydroxy-6-methylanthroquinone, archin, frangulic acid
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