A compound of sulfur in which the sulfur has a valence of −2; e.g., Na2S, HgS; also, a thioether ( i.e., R—S—R′, such as lanthionine). SYN: sulfuret.
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sul·fide or chiefly Brit sul·phide 'səl-.fīd n
1) any of various organic compounds characterized by a sulfur atom attached to two carbon atoms
2) a binary compound (as CuS) of sulfur usu. with a more electropositive element or group: a salt of hydrogen sulfide
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sul·fide (sulґfīd) any binary compound of sulfur; a compound of sulfur with another element or radical or base.Medical dictionary. 2011.