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:
1865–70

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Science Dictionary
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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Example sentences
Sulfur trioxide, not sulfuric acid, is extremely hygroscopic.
Eventually, if it comes in contact with ozone or hydrogen peroxide, it can be converted to sulfur trioxide.
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