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pyritohedron

[pahy-rahy-tuh-hee-druh n, puh-, pahy-rahy-]
noun Crystallography.
  1. a crystal form of 12 pentagonal faces.
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Origin of pyritohedron

1865–70; pyrito- (combining form of pyrite) + -hedron
Related formspy·ri·to·he·dral, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018