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.

Sardīs (Sardes), ĭum (cf.: hae Sardis, has Sardis, Prisc. p. 775 P.; Freund, Annott. ad Cic. Mil. p. 14), f., = Σάρδεις, Sardis (now Sart), the very ancient capital of Lydia, on the Pactolus, the residence of Crœsus; nom. Sardis, Plin. 6, 34, 39, § 215; Hor. Ep. 1, 11, 2.
Gen. Sardium, Curt. 5, 1, 45.
Acc. Sardis, Just. 14, 1, 7; Cic. Sen. 17, 59; Nep. Milt. 4, 1; id. Ages. 3, 5; Sen. Ben. 6, 31, 9; Curt. 3, 12, 6.
Dat. and abl. Sardibus, Liv. 33, 19, 10; 37, 18, 6; Ov. M. 11, 137; Plin. 5, 29, 30, § 100; Val. Max. 5, 4, ext. 6.
Hence, Sardĭānus, a, um, adj., of or belonging to Sardis, Sardian: balani, Plin. 15, 23, 25, § 93: jurisdictio, id. 5, 29, 30, § 111.
In plur. subst.: Sardĭ-āni, ōrum, m., the inhabitants of Sardis, the Sardians, Cic. Fam. 13, 55, 1.