\Oc`ta*he"dral\, a. [See {Octahedron}.]
Having eight faces or sides; of, pertaining to, or formed in,
octahedrons; as, octahedral cleavage.
{Octahedral borax} (Chem.), borax obtained from a saturated
   solution in octahedral crystals, which contain five
   molecules of water of crystallization; distinguished from
   common or prismatic borax.
{Octahedral iron ore} (Min.), magnetite.