Aurochs definitions

ou'rŏks', ôr'ŏks'
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.
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An extinct, shaggy, long-horned wild ox of Eurasia: it is the ancestor of modern domestic cattle.
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An extinct European mammal, Bos primigenius, the ancestor of domestic cattle.
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(zoology) The European bison (Bison bonasus, or Europæus).
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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.