adj. Having eight plane surfaces; thus, in the shape or form of an octahedron.
adj. Of, or pertaining to octahedra.
the GNU version of the Collaborative International Dictionary of English
adj. Having eight faces or sides; of, pertaining to, or formed in, octahedrons.
The Century Dictionary and Cyclopedia
Having eight equal surfaces or faces.
Word Usage
"Rutile is made up mostly of titanium dioxide with two rarer polymorphs anatase or octahedrite, which is a tetragonal mineral of pseudo-octahedral habit, and brookite, which is an orthorhombic mineral, the Doctor explained to her."