D defs.my
Entry 1 sense Webster, 1913

octahedral

/(ŏk`tȧ*hē"dral)/ · oc·ta·he·dral · IPA /ˌɑktəhˈiːdrəl/
01 a. Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal.
  1. 1.
    Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal.
Phrases & compounds
octahedral borax — 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 — magnetite.