Lewis Short
(adjective) : Trans-rhēnānus, a, um
* That is beyond the Rhine, Transrhenish: Germani,Caes. B. G. 5, 2, 5: hostes,i. e. the Batavians,Plin. 19, 1, 2, § 8: lares,Amm. 20, 4, 4. — As subst.: Transrhēnāni, ōrum, m., those living beyond the Rhine, Caes. B. G. 4, 16.
Charlton T. Lewis, Charles Short, A Latin Dictionary