Source : Webster's Revised Unabridged Dictionary (1913)

Octangular \Oc*tan"gu*lar\, a. [L. octangulus eight-cornered;
   octo eight + angulus angle.]
   Having eight angles; eight-angled. -- {Oc*tan"gu*lar*ness},
   n.

Source : WordNet®

octangular
     adj : of or relating to or shaped like an octagon [syn: {octagonal}]