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The Collaborative International Dictionary

Hyposulphurous \Hy`po*sul"phur*ous\, a. [Pref. hypo- + sulphurous.] (Chem.) Pertaining to, or containing, sulphur, all, or a part, in a low state of oxidation. Hyposulphurous acid.

  1. Thiosulphuric acid. [Obs.]

  2. 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.