Lewis Short
(adjective) : Bonna, ae, f.
* A city on the Rhine, now Bonn, Tac. H. 4, 19; 4, 25; 70, 77; 5, 22; Flor. 4, 12, 26.—Hence, Bonnensis, e, , of Bonna: castra,Tac. H. 4, 20; 4, 62: proelium,id. ib. 4, 20.
Charlton T. Lewis, Charles Short, A Latin Dictionary