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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Isatin  \I"sa*tin\,  n.  [See  {Isatis}.]  (Chem.) 
  An  orange-red  crystalline  substance,  {C8H5NO2},  obtained  by 
  the  oxidation  of  indigo  blue.  It  is  also  produced  from 
  certain  derivatives  of  benzoic  acid,  and  is  one  important 
  source  of  artificial  indigo.  [Written  also  less  properly,