Lewis Short
(adjective) : insŭlānus, a, um, insula
* Of or belonging to an island: preces,offered by islanders,Sid. Ep. 9, 3; Pacat. Pan. Theod. 23, 3.—Hence, subst.: insŭlānus, i, m., an islander, Cic. N. D. 3, 18, 45.
Charlton T. Lewis, Charles Short, A Latin Dictionary