H2SO3

1 definition found

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

  Sulphurous \Sul"phur*ous\, a. [L. sulphurosus, sulfurosus: cf.
     F. sulfureux.]
     1. Of or pertaining to sulphur.
        [1913 Webster]
  
     2. (Chem.)


        (a) Derived from, or containing, sulphur; specifically,
            designating those compounds in which the element has a
            lower valence as contrasted with the sulphuric
            compounds.
        (b) Having the characteristic odor of sulphur dioxide, or
            of hydrogen sulphide, or of other sulphur compounds.
            [1913 Webster]
  
     {Sulphurous acid}.
        (a) Sulphur dioxide. See under {Sulphur}. [Obs.]
        (b) An acid, {H2SO3}, not known in the free state except
            as a solution of sulphur dioxide in water, but forming
            a well-known series of salts (the sulphites).
  
     {Sulphurous anhydride} (Chem.), sulphur dioxide. See under
        {Sulphur}.
        [1913 Webster]