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Webster 1913 Edition

Noun.

[Pref.

bi-

sulphide

(Chem.)

A sulphide having two atoms of sulphur in the molecule; a disulphide, as in iron pyrites, FeS2; – less frequently called bisulphuret.

bisulphide ‎(plural bisulphides)

The term bisulfide is rather dated, and is often avoided due to the ambiguity of the bi- prefix most often being used for mixed metal and hydrogen salts.