Lewis & Short

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Ărīmĭnum, i, n., a town in Umbria, on the shore of the Adriatic, at the mouth of a river of the same name; the most northern place of Italy proper, connected with Rome by the Via Flaminia, now Rimini, Plin. 3, 15, 20, § 115; Luc. 1, 231; cf. Mann. Ital. I. 455.
Hence, Ărīmĭnensis, e, adj., pertaining to Ariminum: folia, Hor. Epod. 5, 42: ager, Plin. 10, 21, 25, § 50; subst.: Ărīmĭnenses, ium, m., the inhabitants of Ariminum, Cic. Verr. 2, 1, 14; id. Caecin. 35, 112.