† hydrosulphurous, a. Chem. Obs.
(-ˈsʌlfjʊrəs)
[f. as prec. + sulphurous.]
In hydrosulphurous acid, a name given first to dithionic acid; afterwards to hyposulphurous acid, or hydrogen hyposulphite, H2S2O4.
| 1855 in Mayne Expos. Lex. 1872–94 [see hyposulphurous]. |