Pyrite Definition

pīrīt
pyrites
noun
pyrites
A hard, brittle, yellow mineral, FeS2, dimorphic with marcasite and occurring abundantly as a native ore, used to make sulfuric acid; iron sulfide.
Webster's New World
(usually as a plural: pyrites) Any metallic-looking sulphide, such as the above, which is the most common.
Wiktionary
(solid state chemistry) (usually as a plural: pyrites) Any metal dichalcogenide that is isostructural to the common mineral.
Copper diselenide can occur both as a marcasite and a pyrite.
Wiktionary
Synonyms:
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Other Word Forms of Pyrite

Noun

Singular:
pyrite
Plural:
pyrites

Origin of Pyrite

  • recorded since 1555, from Old French (=modern) pyrite (12c.), from Latin pyrites, from Ancient Greek πυρίτης λιθός (pyrites lithos) "stone of fire, flint" (so called because it glitters), notably the first part: adjective πυρίτης (puritēs, “of or in fire”), from πῦρ (pur, “fire”)

    From Wiktionary

  • Middle English perides, pirite from Old French pirite from Latin pyrītēs flint pyrites

    From American Heritage Dictionary of the English Language, 5th Edition

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