The Collaborative International Dictionary of English. 2000.
persulphide — … Useful english dictionary
persulphuret — Persulphide Per*sul phide, n. (Chem.) A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide; formerly called {persulphuret}. [1913 Webster] … The Collaborative International Dictionary of English
Persulphuret — Per*sul phu*ret, n. (Chem.) A persulphide. [Obs.] [1913 Webster] … The Collaborative International Dictionary of English
Hydrogen disulfide — Hydrogen disulfide … Wikipedia
