Lewis Short
(adjective) : nāvĭgābĭlis, e, navigo
* Navigable: amnis,Liv. 38, 3: mare,id. 35, 44: fossa,Tac. A. 15, 42: litora,id. ib. 13, 53: flumen,Col. 1, 2, 3: fontes magnorum fluminum, Auct. ap. Quint. 8, 3, 76.
Charlton T. Lewis, Charles Short, A Latin Dictionary