Noun aurochs has 2 senses
  1. wisent, aurochs, Bison bonasus - European bison having a smaller and higher head than the North American bison
    --1 is a kind of bison
    --1 is a member of genus Bison
  2. aurochs, urus, Bos primigenius - large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle
    --2 is a kind of ox, wild ox
    --2 is a member of Bos, genus Bos
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