Century Dictionary and Cyclopedia
- Obtained from sulphuric acid by the action of heat.
- adj. UK alternative spelling of pyrosulfuric.
GNU Webster's 1913
- adj. (Chem.) Pertaining to, or designating, an acid called also
disulphuricacid) 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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