trisulphide
noun
any sulphide containing three sulphur atoms per molecule
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for trisulphide
Historical Examples of trisulphide
On heating in absence of air, it decomposes into the trisulphide and sulphur.
The triselenide is less volatile than the trisulphide, and is pale green in color.
The two sulphides of antimony are called the trisulphide and the pentasulphide respectively.
An Elementary Study of ChemistryWilliam McPherson