Source : Webster's Revised Unabridged Dictionary (1913)

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.