A wild ox (Bos primigenius) of Europe, northern Africa, and western Asia that became extinct in the 17th century and is believed to be the ancestor of domestic cattle.
An extinct, shaggy, long-horned wild ox of Eurasia: it is the ancestor of modern domestic cattle.
An extinct European mammal, Bos primigenius, the ancestor of domestic cattle.
(zoology) The European bison (Bison bonasus, or Europæus).
Origin of aurochs
From German Aurochs, an early variant of Auerochse, from Middle High German ūrochse "aurochs" from Old High German ūrohso "aurochs", a compound consisting of ūro "aurochs" (from Proto-Germanic *ūraz, *ūrô (“aurochs”)) + ohso "ox". Akin to Old English ūr "aurochs", Old Norse úrr (“aurochs”), Middle Low German ūrosse "aurochs", Old English oxa "ox". More at ox.