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From: Webster's Revised Unabridged Dictionary (1913)

 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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