GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Disulphuric , a. [Pref. di- + sulphuric.] (Chem.) Applied to an acid having in each molecule two atoms of sulphur in the higher state of oxidation.
   1913 Webster
   Disulphuric acid, a thick oily liquid, H2S2O7, called also Nordhausen acid (from Nordhausen in the Harts, where it was originally manufactured), fuming sulphuric acid, and especially pyrosulphuric acid. See under Pyrosulphuric.
   1913 Webster
   
         
       

2.       
   Pyrosulphuric , a. [Pyro- + -sulphuric.] (Chem.) 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.
   1913 Webster