Urus \U"rus\, n. [L.; of Teutonic origin. See Aurochs.]

(Zo["o]l.) 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 C[ae]sar. It had very large horns, and was hardly capable of domestication. Called also, ur, ure, and tur.

Source: Webster's Revised Unabridged Dictionary (1913)