litoptern

 
Pronunciation: /lɪˈtɒptəːn/

noun

  • an extinct South American hoofed mammal resembling a horse or camel, found from the Palaeocene to the Pleistocene epochs.
    • Order Litopterna: several families

Origin:

early 20th century: from modern Latin Litopterna, from Greek litos 'smooth' + pternē 'heel bone'