2 definitions found From WordNet (r) 2.0 [wn]: pyrite noun: a common mineral (iron disulfide) that has a pale yellow color [syn: {iron pyrite}, {fool's gold}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Pyrite \Pyr"ite\, noun; pl. {Pyrites}. [Cf. F. pyrite. See {Pyrites}.] (Min.) A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. Hence sable coal his massy couch extends, And stars of gold the sparkling pyrite blends. --E. Darwin.

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