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[kon-dl-ahrth] /ˈkɒn dlˌɑrθ/
any of the primitive ungulate mammals of the extinct order Condylarthra, from the Paleocene and Eocene epochs, having a slender body, low-crowned teeth, and five-toed feet, each toe ending in a small hoof.
1880-85; < New Latin Condylarthra (neuter plural) < Greek kóndyl(os) condyle + -arthra, neuter plural of arthrus -jointed, derivative of árthron joint Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for condylarth

extinct group of mammals that includes the ancestral forms of later, more advanced ungulates (that is, hoofed placental mammals). The name Condylarthra was once applied to a formal taxonomic order, but it is now used informally to refer to ungulates of Late Cretaceous and Early Paleogene times. Their greatest diversity occurred during the Paleocene Epoch (65.5-55.8 million years ago), but similar forms persisted into the middle of Oligocene Epoch and died out about 30 million years ago.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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