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thiosulphuric acid
thiosulphuric adj. 
/ˌθʌɪə(ʊ)sʌlˈfjɔːrɪk/,
Brit. /ˌθʌɪə(ʊ)sʌlˈfjʊərɪk/
, /ˌθʌɪə(ʊ)sʌlˈfjʊərɪk//ˌθʌɪə(ʊ)sʌlˈfjɔːrɪk/U.S. /ˌθaɪoʊˌsəlˈfjʊrɪk/
in thiosulphuric acid, H2S2O3, an acid only known in solution and soon decomposing, the salts of which are stable, and are applied in bleaching and photography; it is sulphuric acid, H2SO4, in which one atom of oxygen is replaced by sulphur; formerly called hyposulphurous acid./ˌθaɪoʊˌsəlˈfjʊrɪk/ΘΚΠ
the world > matter > chemistry > chemical substances > acids > [noun] > acids-named > containing sulphur > thiosulphuric acid
hyposulphurous acid1817
thiosulphuric acid1868
1868 H. Watts Fownes's Man. Elem. Chem. (ed. 10) 214 Thiosulphuric Acid..is scarcely known.
1874 Jrnl. Chem. Soc. 27 770 On the Constitution of Hyposulphurous (Thiosulphuric) Acid.
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