perissodactyl, perissodactylic, perissodactylous 1. Having an uneven number of toes or digits on each foot. 2. Any mammal of the order Perissodactyla, comprising the odd-toed hoofed quadrupeds and including the tapirs, rhinoceroses, and horses.perissodactylous 1. Having an odd number of digits on a hand or foot. 2. A reference to the Perissodactyla.