noun. an order of hooved mammals of the subclass Eutheria (including pigs and peccaries and hippopotami and members of the suborder Ruminantia) having an even number of functional toes.
1. Adjective Deer are in the artiodactyla order with about 220 other species. 2. Noun, singular or mass The hippopotamus belongs to the order artiodactyla, which includes hoofed animals with an even number of toes.
