Zoology. having an even number of toes or digits on each foot.
a hoofed, even-toed mammal of the order Artiodactyla, comprising the pigs, hippopotamuses, camels, deer, giraffes, pronghorns, sheep, goats, antelope, and cattle.
Compare perissodactyl.

1840–50; < Neo-Latin; see artio-, dactyl

artiodactylous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
artiodactyl (ˌɑːtɪəʊˈdæktɪl)
1.  any placental mammal of the order Artiodactyla, having hooves with an even number of toes; an even-toed ungulate. The order includes pigs, hippopotamuses, camels, deer, cattle, and antelopes
2.  of, relating to, or belonging to the order Artiodactyla
[C19: from New Latin artiodactylus, from Greek ártios even + daktulos digit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
artiodactyl   (är'tē-ō-dāk'təl)  Pronunciation Key 
Any of various hoofed mammals of the order Artiodactyla, having an even number of toes on each foot. Artiodactyls include the pig, sheep, ox, deer, giraffe, and hippopotamus. Also called even-toed ungulate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


any member of the mammalian order Artiodactyla, or even-toed ungulates, which includes the pigs (see table), peccaries, hippopotamuses, camels, chevrotains, deer, giraffes, pronghorn, antelopes, sheep (see table), goats (see table), and cattle (see beef and dairy tables). It is one of the larger mammal orders, containing about 150 species, a total that may be somewhat reduced with continuing revision of their classification. Many artiodactyls are well-known to man, and the order as a whole is of more economic and cultural benefit than any other group of mammals. The much larger order of rodents (Rodentia) affects man primarily in a negative way, by competing with him or impeding his economic and cultural progress

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
But exactly where hippos sit on the artiodactyl family tree has proved devilishly difficult to discern.
According to two research teams, the ancient whale remains reveal telltale signs of artiodactyl ancestry.
The upper conglomerate member has yielded a single fragmentary jaw of an unidentified artiodactyl.
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