Etymology
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aurochs (n.)

1766, misapplication to the European bison (Bos bison) of a word that actually refers to a species of wild cattle (Bos ursus) that went extinct early 17c.; from German Aurochs, from Old High German urohso, from uro "aurochs" (cognate with Old English ur, Old Norse ürr), which is of unknown origin, + ohso "ox" (see ox). Latin urus and Greek ouros are Germanic loan-words.

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Definitions of aurochs

aurochs (n.)
European bison having a smaller and higher head than the North American bison;
Synonyms: wisent / Bison bonasus
aurochs (n.)
large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle;
Synonyms: urus / Bos primigenius
From wordnet.princeton.edu