thiosulfuric acid

noun Chemistry.
an acid, H 2 S 2 O 3 , that may be regarded as sulfuric acid with one oxygen atom replaced by sulfur.

1870–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

thiosulfuric acid thi·o·sul·fu·ric acid (thī'ō-sŭl-fyur'ĭk)
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.
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