Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Ā̆răbus, a, um, adj. [a parallel form with Arabs, as Aethiopus with Aethiops; cf. Serv. ad Verg. A. 7, 605; Charis. p. 99 P.], Arabian, Lucil. ap. Charis. p. 99: ros, Ov. H. 15, 76 Heins.: lapis, Plin. 36, 21, 41, § 153.—Ā̆răbi, ōrum, m., the Arabs, Arabians, C. Cassius ap. Charis. p. 99: Verg. A. 7, 605.
2. Ā̆răbus, i, m., = Αραβις, Ptol.; Ἀράβιος, Arrian; Ἄρβις, Strab., a river in Gedrosia, now Korkes, Curt. 9, 10, ubi v. Zumpt.
3. Ā̆răbus, i, m., the son of Apollo and Babylon, represented as the inventor of the medical art, Plin. 7, 56, 57, § 196.