Source : Webster's Revised Unabridged Dictionary (1913)

Octogenary \Oc*tog"e*na*ry\, a. [L. octogenarrus, from octogeni
   eighty each, octoginta eighty, fr. octo eight. See {Eight},
   {Eighty}.]
   Of eighty years of age. ``Being then octogenary.'' --Aubrey.