| sulfurous | Designating a sulfur compound in which sulfur has a valence of +4 as contrasted to sulfuric compounds in which sulfur has a valence of +6, or sulfides (-2). (05 Mar 2000) |
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| sulfurous acid | H2SO3;a solution of about 6% sulfur dioxide in water; used chiefly as a disinfectant and bleaching agent, and occasionally as a spray in tonsillitis; it has been used externally for its parasiticidal effect in various skin diseases. (05 Mar 2000) |
| sulfurous oxide | <chemical> A highly toxic, colourless, nonflammable gas. It is used as a pharmaceutical aid and antioxidant. It is also an environmental air pollutant. Pharmacological action: air pollutants, environmental, antioxidants, pharmaceutic aid. Chemical name: Sulfur dioxide (12 Dec 1998) |