Entry 1 sense Webster, 1913

buttocks

· but·tocks · IPA /ˈbʌ.təks/

01 n. pl. the fleshy part of the human body at the back of the hip, on which a person sits.

1.
the fleshy part of the human body at the back of the hip, on which a person sits.

Syn. arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass.