What does sulfide means in science?

A single atom of sulphur combined to a metal .

e.g.

ZnS = Zinc sulphide.

H2S = Hydrogen sulphide ( Bad eggs smell).

To further clarify the nomenclature (naming system)

ZnSO3 = zinc sulpite ; H2SO3 Sulp[hurous Acid

ZnSO4 = zince sulphate ; H2SO4 Sulphuric Acid.

NB

#1 ; 'S' no oxygen

#2 ; 'SO3' three oxygens

#3 ; 'SO4' four oxygens.

NNB Note the change of one letter to indicate the change of chemical formula.