| sulphur dioxide | |
| —n | |
| Systematic name: sulphur(IV) oxide a colourless soluble pungent gas produced by burning sulphur. It is both an oxidizing and a reducing agent and is used in the manufacture of sulphuric acid, the preservation of a wide range of foodstuffs (E220), bleaching, and disinfecting. Formula: SO2 | |
| sulphur dioxide | |
noun | |
| a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain [syn: sulfur dioxide] |
| a scrap or morsel of food left at a meal. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |