The Collaborative International Dictionary
Pyritohedral
Pyritohedral \Pyr`i*to*he"dral\, a. [See Pyritohedron.] (Crystallog.) Like pyrites in hemihedral form.
Wiktionary
pyritohedral
a. 1 Having the shape of pyrites. 2 (context mathematics English) Having the shape of a pyritohedron.