Lewis & Short

Mēdi, ōrum, m., = Μῆδοι, the Medes; poet. also for the Assyrians, Persians, Parthians, Mel. 1, 2, 5; Cic. Off. 2, 12, 41; Hor. C. 1, 2, 51; 2, 16, 6; Luc. 8, 386; Pers. 3, 53.
In sing.: Medusque et Indus, Hor. C. 4, 14, 42: pervigil, Val. Fl. 5, 604.
Hence,

  1. A. Mēdus, a, um, adj., Median, Assyrian, etc.: Hydaspes, Verg. G. 4, 211: acinaces, Hor. C. 1, 27, 5: sagittae, Prop. 3, 10 (4, 11), 11: flumen, i. e. doubtless the Euphrates, the most famous river of the remote East; though some understand it to mean the river Medus, a small branch of the Araxes, mentioned by Strabo, Hor. C. 2, 9, 21.
  2. B. Mēdĭa, ae, f., = Μηδία, a country lying between Armenia, Parthia, Hyrcania, and Assyria, the modern Azerbijan, Shirvan, Ghilan, and Mazanderan, Plin. 6, 26, 29, § 114; Verg. G. 2, 126.
  3. C. Mēdĭcus, a, um, adj., Median, Assyrian, Persian, etc.: vestis, Persian, Nep. Paus. 3: rura, Luc. 8, 368: arbor, the orange-tree, Plin. 12, 3, 7, § 15: mala, Assyrian, i. e. oranges, citrons, id. 15, 14, 14, § 47: smaragdi, id. 37, 5, 18, § 71: dea, i. e. Nemesis, a statue of Parian marble, Aus. Ep. 24, 54.
    Mē-dĭcus, i, m., a surname of the emperor Verus, on account of his victory over the Medes, Capitol. Verr. 7; v. Medica.