Perissodactyla; odd-toed ungulates
Taxonomic term for the order of odd-toed ungulates, including horses, tapirs, and rhinoceroses. Used in biological contexts.
Horses belong to the order Perissodactyla.
I learned the difference between Perissodactyla and Artiodactyla.
From 奇 (odd) + 蹄 (hoof) + 目 (order), a direct calque of the taxonomic name Perissodactyla.