† hyposulphuricadj.
Chemistry. Obsolete.
In hyposulphuric acid, old name of dithionic adj. acid.
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hyposulphuric acid1819
1819 J. G. Children Ess. Chem. Anal. 433 The authors [Welter and Gay Lussac] propose to name this new acid, the hyposulphuric, by analogy with the hyposulphurous, to denote that it contains less oxygen than sulphuric acid, and more than sulphurous acid.
1894 H. E. Roscoe & C. Schorlemmer Treat. Chem. I. 415 Dithionic Acid (H2S2O6)..formerly called hyposulphuric acid, was discovered by Welter and Gay Lussac in 1819.
This entry has not yet been fully updated (first published 1899; most recently modified version published online June 2019).
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