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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hyponitrous  \Hy`po*ni"trous\,  a.  [Pref.  hypo-  +  nitrous.] 
  Containing  or  derived  from  nitrogen  having  a  lower  valence 
  than  in  nitrous  compounds. 
  {Hyponitrous  acid}  (Chem.),  an  unstable  nitrogen  acid,  {NOH}, 
  whose  salts  are  produced  by  reduction  of  the  nitrates, 
  although  the  acid  itself  is  not  isolated  in  the  free  state 
  except  as  a  solution  in  water;  --  called  also  {nitrosylic