a. (Chem.) Pertaining to, or designating, an acid obtained by the reduction of sulphurous acid. See
a. [ Pref. hypo- + sulphurous. ] (Chem.) Pertaining to, or containing, sulphur, all, or a part, in a low state of oxidation. [ 1913 Webster ]
Hyposulphurous acid.
a. [ L. sulphurosus, sulfurosus: cf. F. sulfureux. ]
Sulphurous acid.
Sulphurous anhydride (Chem.),