1. 
   Convolvulin
   Con·vol'vu·lin noun (Chemistry) A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.
   Found op http://www.encyclo.co.uk/webster/C/154
   
   
2. 
   Convolvulin
   • (n.) A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.
   Found op http://thinkexist.com/dictionary/meaning/convolvulin/
   
   

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