sulfide

adj. containing sulfide (Chemistry)

n. compound of sulfur and another element or radical (Chemistry)

The term sulfide (also spelled sulphide, see spelling) refers to several types of chemical compounds containing  sulfur in its lowest oxidation number of −2.Formally, "sulfide" is the dianion, S2−, which exists in strongly alkaline aqueous solutions formed from H2S or alkali metal salts such as Li2S, Na2S, and K2S. Sulfide is exceptionally basic and, with a pKa > 14, it does not exist in appreciable concentrations even in highly alkaline water, being undetectable at pH < ~15 (8 M NaOH). Instead, sulfide combines with protons to form HS−, which is variously called hydrogen sulfide ion, hydrosulfide ion, sulfhydryl ion, or bisulfide ion. At still lower pH's (<7), HS− converts to H2S, hydrogen sulfide. Thus, the exact sulfur species obtained upon dissolving sulfide salts depends on the pH of the final solution.
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Noun
1. a compound of sulphur and some other element that is more electropositive
(synonym) sulphide
(hypernym) compound, chemical compound
(hyponym) pyrites
(substance-meronym) sulfur, S, sulphur, atomic number 16

n. sulfide, compound of sulfur and another element

n. sulphide, sulphuret