Lewis & Short

quattŭor, less correctly quātŭor (also written quattor), num. adj. [kindr. with Sanscr. catur; Gr. τέτταρες from τέτϝαρες], four: ter quattuor corpora, Enn. ap. Cic. Div. 1, 48, 108 (Ann. v. 96 Vahl.); Plaut. Most. 3, 1, 102; Cic. Univ. 5: ex centum quattuor centuriis, id. Rep. 2, 22, 39: tria aut quattuor paria amicorum, id. Lael. 4, 15; Hor. S. 1, 3, 8; Verg. E. 5, 65; Juv. 5, 47.