Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
bellor, āri, 1, dep. (collat. form of bello), to carry on war, to war, to fight (poet.): et pictis bellantur Amazones armis, Verg. A. 11, 660: et nudis bellantur equis, Sil. 2, 349; cf. Non. p. 472, 9; Prisc. 8, 4, 24, p. 796 P.