Lewis & Short

Ăgȳrĭum, i, n., a very old town in Sicily, not far from Enna, the birthplace of Diodorus Siculus, now S. Filippo d’Argiro, Cic. Verr. 2, 3, 28.
Hence, Ăgyrĭnen-ses, ium, Cic. Verr. 2, 3, 28; or Ăgyrī-ni, orum, inhabitants of Agyrium, Plin. 3, 8, 14, § 91.