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]

WordNet (r) 3.0 (2006):

sulphide
    n 1: a compound of sulphur and some other element that is more
         electropositive [syn: sulfide, sulphide]