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The Collaborative International Dictionary
hyposulphurous acid

Thiosulphuric \Thi`o*sul*phur"ic\, a. [Thio- + sulphuric.] (Chem.) Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.

Wiktionary
hyposulphurous acid

n. (context chemistry English) (alternative spelling of hyposulfurous acid English)