| Noun | 1. | aurochs - European bison having a smaller and higher head than the North American bisongenus Bison - sometimes considered a subgenus of genus Bos: American buffalo bison - any of several large humped bovids having shaggy manes and large heads and short horns |
| 2. | aurochs - large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle |