Hyposulphuric /(?)/

Hy·po·sul·phur·ic

Hyposulphuric

a.
  1. Pertaining to, or containing, sulphur in a lower state of oxidation than in the sulphuric compounds; as, hyposulphuric acid. (Chem.)

Phrases & Compounds
Hyposulphuric acid
an acid, H2S2O6, obtained by the action of manganese dioxide on sulphur dioxide, and known only in a watery solution and in its salts; -- called also dithionic acid. See Dithionic.