Lewis Short
(adjective) : Ārētīnus (Ārr-), a, um
* Of or pertaining to the town Aretium: testa,Mart. 1, 54: vasa,id. 14, 98; cf. Müll. Etrusk. 2, 244.
* Subst.: Ārētīni, ōrum, m., the inhabitants of Aretium, Cic. Att. 1, 14, 9; Plin. 3, 5, 8, § 52.
Charlton T. Lewis, Charles Short, A Latin Dictionary