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. 2019
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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.