Definition of pyrosulphuric acid in English:

pyrosulphuric acid

(US pyrosulfuric acid)

noun

Chemistry
  • A crystalline oxyacid of sulphur which is a powerful protonating agent and a major component of fuming sulphuric acid or oleum.

    Formula: (HO)₂SO₂·O·SO₂(OH)₂.

Origin

Mid 19th century.