octāvārĭus — Lewis & Short
octāvārĭus, a, um, adj.id.,
I of or belonging to the eighth part (post-class.):
vectigal,a tax of the eighth part, Cod. Just. 7, 4, 65.—
II Subst.: octāvārĭus, ĭi, m., a receiver of this tax: octavarii vectigal accipiant, Cod. Th. 4, 12, 8; cf. octavus, II. B.