persulphide Chem.
(pəˈsʌlfaɪd)
[per- 5.]
That sulphide of any element or basic radical which contains the greatest proportion of sulphur. Originally called persulphuret. Now usually more definitely named, as trisulphide, pentasulphide, etc.; e.g. persulphide or persulphuret of arsenic, or arsenious sulphide = arsenic trisulphide, As2S3.
| 1856 Miller Elem. Chem. II. 585 Persulphide of Hydrogen (HS5?)—In order to procure this compound it is usual to prepare first a persulphide of calcium (CaS5), which may be formed by boiling equal weights of slacked lime and powdered sulphur in water. |