The story
From Rheum emodi (syn. of Rheum australe (Himalayan rhubarb) + -in.
Etymology from Wiktionary, CC BY-SA 4.0.
emodin
Today it means: A purgative resin, 6-methyl-1,3,8-trihydroxyanthraquinone, obtained from some rhubarbs and other plants. Full definition →