from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
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- noun inorganic chemistry An
unstableacid, H2S2O3, formally derivedfrom sulfuric acidby the substitutionof a sulfur atomfor an oxygenone; it is known only in solutionor as its saltsand esters, the thiosulfates.
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