Urus

• (n.) A very large, powerful, and savage extinct bovine animal (Bos urus / primigenius) anciently abundant in Europe. It appears to have still existed in the time of Julius Caesar. It had very large horns, and was hardly capable of domestication. Called also, ur, ure, and tur.
Found on http://thinkexist.com/dictionary/meaning/urus/

urus

<zoology> A very large, powerful, and savage extinct bovine animal (Bos urus or primigenius) anciently abundant in Europe. It appears to have still existed in the time of Julius Caesar. It had very large horns, and was hardly capable of domestication. Called also, ur, ure, and tur. ... Origin: L.; of Teutonic origin. See Aurochs. ... Source: ...
Found on http://www.encyclo.co.uk/local/20973

urus

Bos primigenius noun large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle
Found on https://www.encyclo.co.uk/local/20974

Urus

The urus (Bos taurus) was the ancient wild ox of Europe, the ancestor of the existing domesticated forms.
Found on http://www.probertencyclopaedia.com/browse/BU.HTM
No exact match found