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An acid, H2S2O3, formed by replacement of an oxygen atom by a sulfur atom in sulfuric acid, found only in solution or as its salts and esters.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
thi′o•sul•fu′ric ac′id(ˈθaɪ oʊ sʌlˈfyʊər ɪk, ˌθaɪ-)
an acid, H2S2O3, derived from sulfuric acid.
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