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From: Webster's Revised Unabridged Dictionary (1913)

 Pyr·o·sul·phu·ric a.  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.
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