Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

Sĭdĭcīni, ōrum, m., a people in Campania, whose chief town was Teanum, on the north-eastern side of Mount Massicus, Liv. 7, 29; 8, 1 sq.; 8, 15 sq.; Cic. Phil. 2, 41, 107.
Sing.: de Egnatii Sidicini nomine, Cic. Att. 6, 1, 23.
Hence, Sĭdĭcīnus, a, um, adj., of or belonging to the Sidicini, Sidicinian: ager, Liv 10, 14; 26, 9: aequora, Verg. A. 7, 727: cohors, Sil. 5, 551: olivae, Plin. 15, 3, 4, § 16.