• Webster's Revised Unabridged Dictionary
    • n Convolvulin (Chem) A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.
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Century Dictionary and Cyclopedia
    • n convolvulin A glucoside, the active purgative principle of jalap.
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In literature:

Convolvulin constitutes nearly 20% of the resin.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 2" by Various