pyrite noun. ['pʌɪrʌɪt] L15.
[Old & mod. French, or Latin PYRITES: see -ITE¹.]
1. Orig. (also pyrite stone), = PYRITES 1. Later, = PYRITES 2. L15-L18.

2. Mineralogy. Native iron disulphide, FeS₂, crystallizing in the cubic system as a brassy-yellow mineral with a metallic lustre. Cf. PYRITES. M19.

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