sulfur dioxide

== English == === Alternative forms === sulphur dioxide (Commonwealth) === Noun === sulfur dioxide (uncountable) (American spelling, inorganic chemistry) 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. ==== Translations ====