Tri-ōc'ta-hē'dral, a.
a. [Lat. tri, q. v., and Eng. octa-hedral.] (Crystallog.) Presenting three ranges of faces, one above another, each range containing eight faces.
a. [Lat. tri, q. v., and Eng. octa-hedral.] (Crystallog.) Presenting three ranges of faces, one above another, each range containing eight faces.