[te.tar.to.he.dral] adj [Gk tetartos fourth; akin to Gk tettares four--more at four] (ca. 1858) of a crystal: having one fourth the number of planes required by complete symmetry--compare hemihedral, holohedral
TETARTOHEDRAL
Meaning of TETARTOHEDRAL in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012