Pyr″ite (?), n.; 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.