(n)in former classifications a major division of Mammalia comprising all hoofed mammals; now divided into the orders Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates)
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
‖n. pl. [ NL., fr. L. ungula hoof. ] (Zool.) An extensive group of mammals including all those that have hoofs. It comprises the Artiodactyla and Perissodactyla. [ 1913 Webster ]