pyritohedron

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

noun Crystallography.

a crystal form of 12 pentagonal faces.

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. 2019