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pyritohedron

American  
[pahy-rahy-tuh-hee-druhn, puh-, pahy-rahy-] / paɪˌraɪ təˈhi drən, pə-, ˌpaɪ raɪ- /

noun

Crystallography.
  1. a crystal form of 12 pentagonal faces.


Other Word Forms

Etymology

Origin of pyritohedron

1865–70; pyrito- (combining form of pyrite ) + -hedron

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