from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Alternative spelling of pyrosulfuric.
from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
from The Century Dictionary and Cyclopedia
- Obtained from sulphuric acid by the action of heat.
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