Monosulphide
Pronunciation : Mon`o*sul"phide
Part of Speech : n.
Etymology : [Mono- + sulphide.] (Chem.)
Definition : Defn: A sulphide containing one atom of sulphur, and analogous to a monoxide; -- contrasted with a Ant: polysulphide; as, galena is a monosulphide.
Source : Webster's Unabridged Dictionary, 1913