Thi·o·sul·phur·ic a. Chem. Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.
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Hy·dro·sul·phur·ous a. Chem. Pertaining to, or designating, an acid obtained by the reduction of sulphurous acid. See Hyposulphurous acid, under Hyposulphurous.
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Hy·po·sul·phur·ous a. Chem. Pertaining to, or containing, sulphur, all, or a part, in a low state of oxidation.
Hyposulphurous acid. (a) Thiosulphuric acid. [Obs.] (b) An acid, H2SO2, obtained by the reduction of sulphurous acid. It is not obtained in the free state, but in an orange-yellow water solution, which is a strong reducing and bleaching agent. Called also hydrosulphurous acid.
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