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Definition of: sulfur trioxide

Chem.
A compound, SO3, formed by the union of sulfur dioxide and oxygen in the presence of a catalytic agent. With water, sulfur trioxide forms sulfuric acid; hence, it is often called sulfuric anhydride.

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Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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