urus

‖n. [ L.; of Teutonic origin. See Aurochs. ] (Zool.) A very large, powerful, and savage extinct bovine animal (Bos urus or Bos 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. [ 1913 Webster ]