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sulfurous acid

noun, Chemistry.
a colorless liquid, H 2 SO 3 , having a suffocating odor, obtained by dissolving sulfur dioxide in water, known mainly by its salts, which are sulfites: used chiefly in organic synthesis and as a bleach.
Origin of sulfurous acid
First recorded in 1780-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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sulfurous acid in Science
sulfurous acid  
A colorless solution of sulfur dioxide in water, characterized by a suffocating sulfurous odor. It is used as a bleaching agent, preservative, and disinfectant. Chemical formula: H2SO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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