Double sulphide

from The Collaborative International Dictionary of English v.0.48

Sulphide \Sul"phide\, n. (Chem.)
   A binary compound of sulphur, or one so regarded; -- formerly
   called {sulphuret}.
   [1913 Webster]

   {Double sulphide} (Chem.), a compound of two sulphides.

   {Hydrogen sulphide}. (Chem.) See under {Hydrogen}.

   {Metallic sulphide}, a binary compound of sulphur with a
      metal.
      [1913 Webster]