noun, plural aurochs.
a large, black European wild ox, Bos primigenius: extinct since 1627.
(not used scientifically) the European bison.

1760–70; < German, variant (now obsolete) of Auerochs, Middle High German ūrochse, Old High German ūrohso, equivalent to ūr (cognate with Old English ūr bison) + ohso ox Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aurochs (ˈɔːrɒks)
n , pl -rochs
Also called: urus a recently extinct member of the cattle tribe, Bos primigenius, that inhabited forests in N Africa, Europe, and SW Asia. It had long horns and is thought to be one of the ancestors of modern cattle
[C18: from German, from Old High German ūrohso, from ūro bison + ohsoox]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1766, misapplication to the European bison (Bos Bison) of a word that actually refers to a species of wild ox (Bos Ursus) that went extinct 17c., from Ger. Aurochs, from O.H.G. urohso, from uro "aurochs" (cognate with O.E. ur, O.N. ürr), of unknown origin, + ohso "ox" (see
ox). L. urus and Gk. ouros are P.Gmc. loan-words
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Likewise, domesticated cows are much smaller than the now-extinct aurochs from which they descended.
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