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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Glyoxal  \Gly*ox"al\,  n.  [Glycol  +  oxalic  +  aldehyde.]  (Chem.) 
  A  white,  amorphous,  deliquescent  powder,  {(CO.H)2},  obtained 
  by  the  partial  oxidation  of  glycol.  It  is  a  double  aldehyde, 
  between  glycol  and  oxalic  acid.