Etymology: (bef. 1000; var of arse , with loss of r before s, as in passel , cuss , etc.; ME ars, er(e)s, OE ærs, ears, c. OFris ers, OS, OHG, ON ars, Gk órrhos; akin to Gk our&amacracute;, OIr err tail)
Definition of 'ass'
Princeton's WordNet
1. (noun)buttocks, nates, 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 the fleshy part of the humanbody that you sit on "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
1. (noun)ass a quadruped of the genusEquus (E. asinus), smaller than the horse, and having a peculiarly harsh bray and long ears. The tame or domestic ass is patient, slow, and sure-footed, and has become the type of obstinacy and stupidity. There are several species of wild asses which are swift-footed