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Meaning Of Pyrosulphuric
a.
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.