Sulfur-trioxide meaning

A toxic corrosive liquid or solid, SO3 , that reacts violently with water and produces dense white fumes upon contact with moist air, used as an oxidant and in the sulfonation of organic compounds.
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A colorless, highly reactive, corrosive compound that exists either as a liquid or as a solid. As a solid, it exists in three forms that may coexist in a given sample. Sulfur trioxide is used as an intermediate in manufacturing sulfuric acid, and in making sulfonates from organic compounds. Chemical formula: SO3.
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(inorganic chemistry) A corrosive liquid, SO3, which forms sulfuric acid on contact with water; made commercially by the oxidation of sulfur dioxide.
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