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 Di·sul·phu·ric a.  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.
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