(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

any of a class of salts formed by the partial neutralization of diprotic or polyprotic acids.

an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)

any of various metallic-looking sulfides (of which pyrite is the commonest)

a sulfide having the unpleasant smell of rotten eggs

a compound containing two atoms of sulfur combined with iron

a yellow sulfide used chiefly as a pigment

a yellow to white crystalline fluorescent compound that occurs naturally as sphalerite or wurtzite and is used as a luminous pigment

an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)