octahedral
oc.ta.he.dral \.a:k-t*-'he--dr*l\ aj 1: having eight plane faces 2: of, relating to, or formed in octahedrons
Webster's English Dictionaryoc.ta.he.dral \.a:k-t*-'he--dr*l\ aj 1: having eight plane faces 2: of, relating to, or formed in octahedrons