Oc′ta‐he″dral (ŏk′tȧ‐hē″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.