pyritohedron

[ pahy-rahy-tuh-hee-druhn, puh-, pahy-rahy- ]

noun

, Crystallography.

1. a crystal form of 12 pentagonal faces.

Other Words From

• py·rito·hedral adjective

Word History and Origins

Origin of pyritohedron¹

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