The Collaborative International Dictionary
Monosulphide
Monosulphide \Mon`o*sul"phide\, n. [Mono- + sulphide.] (Chem.) A sulphide containing one atom of sulphur, and analogous to a monoxide; -- contrasted with a polysulphide; as, galena is a monosulphide.
Wiktionary
monosulphide
n. (alternative spelling of monosulfide English)