Definition of perissodactyl in US English:



  • A mammal of the order Perissodactyla, such as a horse or rhinoceros.

    • ‘The number of teeth is variable, but in many species it is smaller than the number found in perissodactyls.’
    • ‘Artiodactyl and perissodactyl sequences were used to root the trees.’
    • ‘Both the perissodactyls and artiodactyls underwent a period of rapid evolution during the Miocene.’
    • ‘The perissodactyls were once much more numerous.’
    • ‘Intraordinal comparisons indicate equal rates within rodents and variable rates within perissodactyls and artiodactyls.’


  • Relating to or denoting perissodactyls.

    • ‘Most perissodactyl lineages went extinct in the late Eocene or Oligocene.’
    • ‘It actually says, "A solid-hoofed perissodactyl ungulate mammal" which may not be any more satisfactory, but is certainly more thorough.’
    • ‘The horse's single toe on each of its four feet is its most marked anatomical characteristic and makes it a perissodactyl or odd-toed ungulate.’
    • ‘Divergence estimates between extant perissodactyl species were closely correlated with calibration age - the divergence between rhinos and tapirs, for example, differed by an order of magnitude depending on the calibration applied.’