Persulphide

Per·sul'phide noun (Chemistry) A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide ; -- formerly called persulphuret .
Found on http://www.encyclo.co.uk/webster/P/63

Persulphide

• (n.) A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide; -- formerly called persulphuret.
Found on http://thinkexist.com/dictionary/meaning/persulphide/
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