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sulfur trioxide

noun, Chemistry
an irritant, corrosive, low-melting solid, SO 3 , obtained by the oxidation of sulfur dioxide, used as an intermediate in the manufacture of sulfuric acid.
Also called sulfuric anhydride.
Origin of sulfur trioxide
1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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sulfur trioxide in Science
sulfur trioxide  
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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