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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Dioxindol  \Di`ox*in"dol\,  n.  [Pref.  di-  +  oxygen  +  indol.] 
  A  white,  crystalline,  nitrogenous  substance  obtained  by  the 
  reduction  of  isatin.  It  is  a  member  of  the  indol  series;  -- 
  hence  its  name