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.