The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of various hoofed mammals of the order Artiodactyla, which includes cattle, deer, camels, hippopotamuses, sheep, and goats, that have an even number of toes, usually two or sometimes four, on each foot.
n. Any ungulate mammal with an even number of toes and belonging to the Artiodactyla, including pigs, sheep, deer, cattle, and most grazing animals.
the GNU version of the Collaborative International Dictionary of English
n. placental mammal having hooves with an even number of functional toes on each foot; a member of the artiodactyla.
adj. of, pertaining to, or belonging to the order Artiodactyla.
The Century Dictionary and Cyclopedia
Of or pertaining to the Artiodactyla; cloven-footed; even-toed. Also artiodactylous.
n. One of the Artiodactyla.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. of or relating to or belonging to mammals of the order Artiodactyla
n. placental mammal having hooves with an even number of functional toes on each foot
Word Usage
"There are at least eleven different species intermediate between artiodactyls and cetaceans in the fossil record and they occur in precisely the right sequence expected if cetaceans are derived from artiodactyl ancestors."