Sesquisulphide
Pronunciation : Ses`qui*sul"phide
Part of Speech : n.
Etymology : [Sesqui- + sulphide.] (Chem.)
Definition : Defn: A sulphide, analogous to a sesquioxide, containing three atoms of sulphur to two of the other ingredient; -- formerly called also sesquisulphuret; as, orpiment, As2S3 is arsenic sesquisulphide.
Source : Webster's Unabridged Dictionary, 1913