Perissodactyl a

pe-ris-ō-dak′ti-la, n. one of the two divisions of the great mammalian order Ungulata, including the horse, tapir, and rhinoceros, distinguished by the third digit of each limb being symmetrical in itself, by the presence of an odd number of digits on the hind-foot, .—opp. to Artiodactyl a .— adjs. Peri odac′tyl , Peri odac′tylate , Peri odactyl′ic , Peri odac′tylous . [Gr. peri os , beyond the regular number, daktylos , a finger.]