Source : Webster's Revised Unabridged Dictionary (1913)

Vincetoxin \Vin`ce*tox"in\, n. (Chem.)
   A glucoside extracted from the root of the white swallowwort
   ({Vincetoxicum officinale}, a plant of the Asclepias family)
   as a bitter yellow amorphous substance; -- called also
   {asclepiadin}, and {cynanchin}.