perissodactyl Syllabification: (pe·ris·so·dac·tyl)Pronunciation: /pəˌrisəˈdaktəl/ ZoologyDefinition of perissodactyl noun a mammal of the order Perissodactyla, such as a horse or rhinoceros. adjective relating to or denoting perissodactyls. perissodactyl in other Oxford dictionaries Definition of perissodactyl in the British & World English dictionary