An order or a suborder of ungulate or hoofed mammals which are cloven-footed or even-toed and have hoofs in pairs (either two or four), as all ruminants (Bovidœ, Cervidœ, etc.) and hog-like ungulates (Hippopotamidœ, Suidœ, etc.): opposed to odd-toed ungulates or Perissodactyla, as the horse, rhinoceros, tapir, etc.