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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Indogen  \In"do*gen\,  n.  [Indigo  +  -gen.]  (Chem.) 
  A  complex,  nitrogenous  radical,  {C8H5NO},  regarded  as  the 
  essential  nucleus  of  indigo.