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pyritohedron

[pahy-rahy-tuh-hee-druh n, puh-, pahy-rahy-] /paɪˌraɪ təˈhi drən, pə-, ˌpaɪ raɪ-/
noun, Crystallography
1.
a crystal form of 12 pentagonal faces.
Origin
1865-1870
1865-70; pyrito- (combining form of pyrite) + -hedron
Related forms
pyritohedral, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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