[ ˌɒktə'hi:drən , -'hɛd- ]
■ noun ( plural octahedra -drə or ~s ) a three-dimensional shape having eight plane faces, in particular a regular solid figure with eight equal triangular faces.
Derivatives
octahedral adjective
Origin
C16: from Gk oktaedron , neut. (used asnoun) of oktaedros 'eight-faced'.