Disulphuric \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}.