from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An orange crystalline compound, C14H4O2(OH)3CH3, obtained from rhubarb and other plants and used as a laxative.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A purgative resin, 6-methyl-1,3,8-trihydroxyanthraquinone, obtained from some rhubarbs and other plants.
from the GNU version of the Collaborative International Dictionary of English
- 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).
from The Century Dictionary and Cyclopedia
- n. In chem., a glucoside (C15H10O5), crystallizing in orange-yellow prisms, found in the bark of buckthorn and in the root of rhubarb.
New Latin (Rheum) ēmōdī, a species of rhubarb : genitive of ēmōdus (from Greek Ēmōdos, the Himalayas) + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)
Rheum emodi, a Himalayan rhubarb, and -in. (Wiktionary)