pyritohedron
/pɪˌrʌɪtəʊˈhiːdrən/Crystallography
noun
A twelve-sided polyhedron with pentagonal faces, which is particularly common in crystals of pyrite.
Origin
Mid 19th century; earliest use found in John Joseph Griffin (1802–1877), chemist, author, and business manager. From pyrito- + -hedron.
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