octōgēnārĭus — Lewis & Short
octōgēnārĭus, a, um, adj.octogeni,
I containing eighty (post-Aug.):
exheredata ab octogenario patre,who was a man of eighty, was eighty years old, Plin. Ep. 6, 33, 2; Vulg. 2 Reg. 19, 35:
fistula,eighty inches broad, Vitr. 8, 7.—
II Subst.: octōgē-nārĭus, ĭi, m., a commander of eighty soldiers, Inscr. Orell. 3628.