Lewis & Short

Cădūsii (Cădūsi), ōrum, m., = Καδούσιοι, a people in Media, on the Caspian Sea (Atropatene). Mel. 1, 2, 5; Nep. Dat. 1, 2; Liv. 35, 48, 5; Just. 10, 3, 2; Curt. 4, 12, 12; Plin. 6, 16, 18, § 48.
In sing.: Cădusus, i., Avien. Descr. Orb. 910.
Cădūsĭa, ae, f., the country of the Cadusii, Plin. 6, 13, 15, § 36.