odd-toed ungulate odd·toe·dun·gulate uncommon noun 1. placental mammals having hooves with an odd number of toes on each foot Synonymsodd-toed ungulateperissodactylperissodactyl mammal Antonymseven-toed ungulate Related words Broader terms ungulate Narrower terms equinerhinocerostapir Parts Perissodactyla WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.