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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Colocynthin  \Col`o*cyn"thin\,  n.  [Cf.  F.  colocynthine.]  (Chem.) 
  The  active  medicinal  principle  of  colocynth;  a  bitter, 
  yellow,  crystalline  substance,  regarded  as  a  glucoside.