Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Rŭdĭae, ārum, f., a town in Calabria, the birthplace of Ennius, Mel. 2, 4, 7; Plin. 3, 11, 16, § 102; Sil. 12, 397.
Hence, Rŭ-dīnus, a, um, adj., of Rudiœ, the Rudian, an appellation of Ennius, Enn. ap. Cic. de Or. 3, 42, 168 (Ann. v. 440 Vahl.); Cic. Arch. 10; Aus. Technop. 13, 17.