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Definition of Sulfur dioxide
1. 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.
Definition of Sulfur dioxide
1. Noun. (inorganic compound) A toxic gas, of molecular formula SO2 that is found in the emissions of volcanos and those of burning coal or petroleum; dissolves in water to form sulfurous acid and, in the presence of oxygen, sulfuric acid, and is thus responsible for acid rain. ¹
¹ Source: wiktionary.com