pyrosulphuricpyrosulfuricadj.
/ˌpʌɪrə(ʊ)sʌlˈfjʊərɪk/, /ˌpʌɪrə(ʊ)sʌlˈfjɔːrɪk/, U.S. /ˌpaɪroʊˌsəlˈfjʊrɪk/ Chemistry.
pyrosulphuric acid n. 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.
ΚΠ
1869 H. E. Armstrong in Proc. Royal Soc. 18 513 As to the constitution of the body S2O5Cl2, all seems to speak for its being the chloride of pyrosulphuric acid (so-called Nordhausen), to which it bears the same relation as sulphuric chloride to sulphuric acid.
1922 T. M. Lowry Inorg. Chem. xxv. 338 With the exception of pyrosulphuric acid..and sulphuric acid..it is not easy to crystallise out these hydrates.
1954 Thorpe's Dict. Appl. Chem. (ed. 4) XI. 290/1 Pyrosulphuric acid..is a crystalline solid melting at 35°.
2000 W. Henderson Main Group Chem. viii. 122 Sulfuric acid..is prepared by the oxidation of sulfur dioxide to sulfur trioxide,..followed by hydrolysis of the SO3 in sulfuric acid to give pyrosulfuric acid (often called oleum), which is then hydrolysed.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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adj.1869- to shut one's ears
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