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Webster 1913 Edition
Pyrosulphuric
Pyrˊo-sul-phu′ric
,Adj.
[
Pyro-
+ -sulphuric
.] (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.