\Di`sul*phu"ric\, a. [Pref. di- + sulphuric.]
(Chem.)
Applied to an acid having in each molecule two atoms of
sulphur in the higher state of oxidation.
{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}.