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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypophosphoric  \Hy`po*phos*phor"ic\,  a.  [Pref.  hypo-  + 
  phosphoric.]  (Chem.) 
  Pertaining  to  or  derived  from  or  containing,  phosphorus  in 
  a  lower  state  of  oxidation  than  in  phosphoric  compounds;  as 
  hypophosphoric  acid. 
  {Hypophosphoric  acid}  (Chem.),  an  acid,  {P2H4O6},  produced  by 
  the  slow  oxidation  of  moist  phosphorus,  and  isolated  only 
  as  a  solution  in  water.  It  is  regarded  as  a  condensation 
  product  of  one  molecule  of  phosphoric  acid  with  one  of 
  phosphorous  acid,  by  partial  dehydration.