[1] : The Collaborative International Dictionary of English v.0.48

nitrous \ni"trous\, a. l. nitrosus full of natron: cf. f.
   nitreux. see niter.
   1. of, pertaining to, or containing, niter; of the quality of
      niter, or resembling it.
      1913 webster

   2. chem. of, pertaining to, or designating, any one of
      those compounds in which nitrogen has a relatively lower
      valence as contrasted with nitric compounds.
      1913 webster

   nitrous acid chem., a hypothetical acid of nitrogen
      hno2, not known in the free state, but forming a well
      known series of salts, viz., the nitrites.

   nitrous oxide. see laughing gas.
      1913 webster
see also:
niter nitrous acid hno2 nitrous oxide laughing gas 

[2] : WordNet (r) 2.0

nitrous acid
     n : an unstable inorganic acid known only in solution and as
         nitrite salts

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Benzoic Acid, definition of term: Benzoic Acid
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Arsenious Acid, definition of term: Arsenious Acid
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