The Collaborative International Dictionary
Octahedral \Oc`ta*he"dral\, a. [See Octahedron.] 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.
Wiktionary
a. 1 Having eight plane surfaces; thus, in the shape or form of an octahedron. 2 Of, or pertaining to octahedra.
Usage examples of "octahedral".
A piece of glass or porcelain held to the flame will have, if arsenic be present, a deposit on it having the following characters: In the centre a deposit of metallic arsenic, round this a mixture of metallic arsenic and arsenious acid, and outside this another ring of arsenious acid in octahedral crystals.
The crystals are composed of oxalate of lime and appear in the different forms shown in the five sections, of octahedral, decahedral, round and dumb bell shapes.
Martian smectites were aluminosilicates, she found, meaning each unit of the clay had a sheet of aluminum octahedrals sandwiched between two sheets of silicon tetrahedrals.
The intermediate arrangements, with cubic, octahedral, and icosahedra symmetry, had never been used.