Category:Pyrosulphuric

Pyr`o*sul*phu"ric, a. Etym: [pyro- + -sulphuric.] (chem.)

Defn: pertaining to, or designating, an acid called also disulphuric Acid) obtained by distillation of certain sulphates, as a colorless, Thick, oily liquid, h2s2o7 resembling sulphuric acid. It is used in The solution of indigo, in the manufacture of alizarin, and in Dehydration.