A solution of about 6% sulfur dioxide in water; used chiefly as a disinfectant and bleaching agent; it has been used externally for its parasiticidal effect in various skin diseases.
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sulfurous acid n a weak unstable dibasic acid H2SO3 known in solution and through its salts and used as a reducing and bleaching agent and in medicine as an antiseptic
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sul·fur·ous ac·id (səl-fūrґəs) the chemical species H2SO3, which is formed in aqueous solutions of sulfur dioxide, SO2; its salts are sulfites.Medical dictionary. 2011.