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From: Webster's Revised Unabridged Dictionary (1913)

 oc·ta·he·dral a.  Having eight faces or sides; of, pertaining to, or formed in, octahedrons; as, octahedral cleavage; an octahedral crystal.
 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.
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