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The Collaborative International Dictionary
Convolvulin

Convolvulin \Con*vol"vu*lin\, n. (Chem.) A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.

Wiktionary
convolvulin

n. (context organic compound English) A glucoside occurring in jalap (the root of a convolvulaceous plant), used as a purgative.