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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypophosphorous  \Hy`po*phos"phor*ous\,  a.  [Pref.  hypo-  + 
  phosphorous.]  (Chem.) 
  Pertaining  to  or  containing,  phosphorus  in  a  lower  state  of 
  oxidation  than  in  phosphoric  compounds;  as  hypophosphorous 
  {Hypophosphorous  acid}  (Chem.),  an  acid,  {H3PO2},  whose  salts 
  are  produced  by  the  action  of  barium  hygrate  on 
  phosphorus.  It  may  be  obtained  from  its  water  solution,  by 
  exaporation  and  freezing,  as  a  white  crystalline 
  substance.  It  is  a  powerful  reducing  agent.