(chemistry) Any compound having the general formula R₃P=S <=> R₃P⁺S⁻.

(chemistry) a binary compound of lithium and sulfur, Li₂S, sometimes used in lithium batteries

(obsolete, chemistry) carbon disulfide

(organic chemistry) The organic sulfur compound (CH₃)₂S that is a breakdown product of many biological sulfur compounds; it has a number of industrial uses

(inorganic chemistry) The sulfide of mercury, HgS, that occurs as the mineral cinnabar.

(inorganic chemistry) The binary sulfide of ferrous iron, FeS, that occurs in several minerals

(inorganic chemistry) A white, crystalline powder (when pure), usually found in an impure, brown, non-crystalline form.

(mineralogy, chemistry) A family of chemical compounds and minerals with the chemical formula CuₓSᵤ.

(inorganic chemistry) The mixed oxide and sulfide of carbon COS.

(inorganic chemistry) a binary compound of silver and sulfur, Ag₂S