- an acid, H2S2O3, that may be regarded as sulfuric acid with one oxygen atom replaced by sulfur.
Origin of thiosulfuric acid
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- An acid formed by replacement of an oxygen atom by a sulfur atom in sulfuric acid, known only in solution or by its salts and esters.