| 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) |
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| sulfurtransferases | <enzyme> Enzymes which transfer sulfur atoms to various acceptor molecules. Registry number: EC 2.8.1 (12 Dec 1998) |
| sulfuryl | The bivalent radical, -SO2-. (05 Mar 2000) |