Lewis & Short

clūnis, is (mostly plur.; acc. clunem, Juv. 2, 21; 6, 334; Auct. Priap. 19, 2; abl. clune, Hor. S. 2, 8, 91; Juv. 11, 164; Mart. 9, 47, 6; 11, 100, 3; Plin. 10, 50, 71, § 140; 29, 6, 39, § 141; Petr. 23, 3), m. and f. (hence the grammarians vary in the designation of the gender; cf. Voss. Arist. 1, 29, p. 498; Rudd. 1, p. 25, n. 35) [Gr. κλόνις; Sanscr. s)rōni: nates, clunes, Bopp, Gloss. 358 a; cf. 1. cluo], a buttock, haunch.

        1. (α) Masc., Plaut. Fragm. ap. Paul. ex Fest. p. 61, 17 Müll.; and in Non. p. 197, 1; Juv. 11, 164; Mart. 11, 100, 3.
        2. (β) Fem., Hor. S. 1, 2, 89; Cels. 7, 29; Plin. 8, 8, 8, § 25; 29, 6, 39, § 141.
        3. (γ) Dub., * Lucr. 4, 1266; Hor. S. 2, 7, 50; 2, 8, 91; * Liv. 44, 5, 7; Col. 8, 5, 19; 8, 7, 2: Petr. 21, 2; 23, 3; Juv. 2, 21; 5, 167; 6, 334; Plin. 10, 50, 71, § 140; Mart. 9, 47, 6; App. M. 8, p. 208; Arn. 7, p. 239.