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 for Pyrosulphuric
From The Collaborative International Dictionary of English v.0.48 :

  Pyrosulphuric \Pyr`o*sul*phu"ric\, a. [Pyro- + -sulphuric.]
     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]

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