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thiosulphuric acid

British  
/ ˌθaɪəʊsʌlˈfjʊərɪk /

noun

  1. an unstable acid known only in solutions and in the form of its salts. Formula: H 2 S 2 O 3

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The most important of these is thiosulphuric acid.

From Project Gutenberg

The substance is called sodium thiosulphate, and is a salt of the easily decomposed acid H2S2O3, called thiosulphuric acid.

From Project Gutenberg