having an uneven number of toes or digits on each foot.
any mammal of the order Perissodactyla, comprising the odd-toed hoofed quadrupeds and including the tapirs, rhinoceroses, and horses.
Also, perissodactyle [puh-ris-oh-dak-til, -tahyl] .
Compare artiodactyl.

1840–50; < Neo-Latin perissodactylus < Greek perissó(s) uneven, literally, beyond the norm, strange (derivative of périx (preposition and adv.) round about, akin to perí; see peri-) + -daktylos -dactylous

perissodactylous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perissodactyl or perissodactyle (pəˌrɪsəʊˈdæktɪl, pəˌrɪsəʊˈdæktaɪl)
1.  any placental mammal of the order Perissodactyla, having hooves with an odd number of toes: includes horses, tapirs, and rhinoceroses
2.  of, relating to, or belonging to the Perissodactyla
[C19: from New Latin perissodactylus, from Greek perissos uneven + daktulos digit]
perissodactyle or perissodactyle
[C19: from New Latin perissodactylus, from Greek perissos uneven + daktulos digit]
perisso'dactylous or perissodactyle

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
perissodactyl   (pə-rĭs'ō-dāk'təl)  Pronunciation Key 
Any of various hoofed mammals of the order Perissodactyla, having one or three hoofed toes on each hindfoot. During the Tertiary Period, perissodactyls were the dominant herbivorous fauna. Horses, tapirs, and rhinoceroses are perissodactyls. Also called odd-toed ungulate.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


any member of the order Perissodactyla, a group of herbivorous mammals characterized by the possession of either one or three hoofed toes on each hindfoot. They include the horses, asses, and zebras, the tapirs, and the rhinoceroses. The name (Greek perissos, "odd," and daktylos, "finger") was introduced to separate the odd-toed ungulates from the even-toed ones (Artiodactyla), all of which had previously been classified as members of a single group

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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