Lewis Short
(adj.Subst.) : ālārĭus, a, um (less freq. ālāris, e), adj. ala.—In milit. lang.
* That is upon the wing (of an army), of the wing (opp. legionarii, v. ala, II. E.): cohortes alariae et legionariae,i. e. of the allies,Caes. B. C. 1, 73: cum cohortibus alariis,Liv. 10, 40 Weissenb.: alarii equites,id. 40, 40; so Tac. A. 3, 39; 4, 73; 12, 27 al.—Subst., the form ālārĭus, * Cic. Fam. 2, 17: ut ad speciem alariis uteretur,auxiliaries, allies,Caes. B. G. 1, 51.—The form ālāris, e: inter legionarios aut alares,Tac. H. 2, 94: alares Pannonii,id. A. 15, 10: alares exterruit,id. ib. 15, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary