pyritohedron

[pahy-rahy-tuh-hee-druh n, puh-, pahy-rahy-]

noun Crystallography.

a crystal form of 12 pentagonal faces.

Origin of pyritohedron

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

Also called pentagonal dodecahedron.

Related formspy·ri·to·he·dral, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018