Lewis Short
(adjective) : Ŏpĭtergĭum, ii, n.
* A city of Italy, in the territory of the Veneti, now Oderzo, Plin. 3, 19, 23, § 130; Tac. H. 3, 6.—Hence
* Ŏpĭtergīnus, a, um, , of or belonging to Opitergium, Opitergian, Plin. 3, 18, 22, § 126.—Plur. subst.: Ŏpĭtergīni, ōrum, m., the inhabitants of Opitergium, the Opitergians, Flor. 4, 2, 33.
Charlton T. Lewis, Charles Short, A Latin Dictionary