perissodactyl

From Ancient Greek περισσός (perissós, “uneven”) + δάκτυλος (dáktulos, “a finger, toe”).

perissodactyl (plural perissodactyls)

1. Any ungulate mammal with an odd number of toes and belonging to the Perissodactyla, including the horses, zebra, and rhinoceros.
   • 2018, Tim Flannery, Europe: A Natural History, page 102:

     The chalicotheres were among the strangest mammals that ever lived. They were perissodactyls - relatives of horses, rhinos and tapirs - and if all you had seen of one was its head, you might have mistaken it for a very strange horse.

• artiodactyl

• clypeastroids