Susa, æ, and Susa, ôrum, The chiefe citie of Persis.
Lewis and Short: Latin dictionary
Sūsa, ōrum, n., = *sou=sa, ta/,the ancient capital of Persia, now prob. Soos, Plin. 6, 27, 31, 133; Prop. 2, 13 (3, 4), 1; Curt. 5, 1, 7.—Hence, A. Sūsĭānē, ēs, f., the province of Susiana or Susiane, in which Susa was situated, now Khuzistan, Plin. 6, 27, 31, 133.—B. Sūsĭāni, ōrum, m., the inhabitants of Susa or of Susiana, Plin. 6, 27, 31, 133; Curt. 5, 3, 3.—C. Sūsis, ĭdis, adj. f., of or belonging to Susa, Susian, Persian: ora, Sid. poët. Ep. 7, 17: aula, id. ib. 8, 9.