The Collaborative International Dictionary
Tetartohedral
Tetartohedral \Te*tar`to*he"dral\, a. [Gr. ? fourth + ? base.] (Crystallog.) Having one fourth the number of planes which are requisite to complete symmetry. -- Te*tar`to*he"dral*ly, adv.
Wiktionary
tetartohedral
a. (context crystallography English) Having one fourth of the number of planes required for complete symmetry.