The Collaborative International Dictionary
Polysulphide
Polysulphide \Pol`y*sul"phide\, n. [Poly- + sulphide.] (Chem.) A sulphide having more than one atom of sulphur in the molecule; -- contrasted with monosulphide.
Wiktionary
polysulphide
n. (context chemistry English) (alternative spelling of polysulfide English)