1. vacca, ae, f. [Sanscr. vacā, cow; root vaç, to bellow; cf. vagire], a cow, Varr. R. R. 2, 5, 6; Col. 6, 21, 1; Cic. N. D. 1, 27 77; Verg. E. 9, 31; id. G. 2, 524; 3, 177; id. A. 4, 61; Ov. M. 2, 694; Hor. C. 4, 2, 53: boves operariae, used in ploughing, Col. 6, 24. 4; Varr. R. R. 1, 20, 4.