Lewis & Short

nătes, ĭum, v. natis.

nătis, is, more freq. in the plur., nă-tes, ium, f. [akin to Gr. νῶτον, back; cf. νόσφι], the rump, the buttocks.

        1. (α) Sing.: diffissā nate, Hor. S. 1, 8, 46; Auct. Priap. 77, 11; 83, 23: quod ejus natis fulmine icta erat, Paul. ex Fest. s. v. pullus, p. 244 and 245 Müll.
        2. (β) Plur.: nates pervellit, Plaut. Pers. 5, 2, 66: soleā pulsare nates, Juv. 6, 611; Mart. 14, 18, 2; with clunes, id. 3, 53, 3.
          Of the rump of animals: nates turturum donare alicui, Mart. 3, 82, 21.