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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydroquinone  \Hy`dro*qui"none\,  n.  [Hydro-,  2  +  quinone.] 
  A  white  crystalline  substance,  {C6H4(OH)2},  obtained  by  the 
  reduction  of  quinone.  It  is  a  diacid  phenol,  resembling,  and 
  metameric  with  pyrocatechin  and  resorcin.  Called  also 
  {dihydroxy  benzene}.