an extinct, shaggy, long-horned wild ox (Bos primigenius), formerly common in Europe and thought to be an ancestor of modern domestic cattle
See urus in American Heritage Dictionary 4
(yo͝orˈəs)
nounpl.u·rus·es
An extinct wild ox (Bos primigenius) of Europe, northern Africa, and western Asia, believed to be the ancestor of domestic cattle. Also called aurochs.