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.

Castŭlo, ōnis, m. (Liv.), and f. (Sil.), = Καστούλων, a town in Hispania Tarraconensis, near the borders of Baetica, now the village Cazlona, Liv. 24, 41, 7; 28, 19, 2 sq.; Sil. 3, 99; 3, 391; Plin. 3, 2, 3, § 17.
Hence,

    1. 2. Castŭlōnensis, e, adj., of Castulo: saltus, Asin. ap. Cic. Fam. 10, 31, 1; Caes. B. C. 1, 38; Liv. 22, 20, 12; and as subst.: Castŭlōnenses, ium, m., the inhabitants of Castulo, Plin. 3, 3, 4, § 25.