From The Collaborative International Dictionary of English v.0.48:

Aurochs \Au"rochs\ ([add]"r[o^]ks), n. [G. auerochs, OHG.
   [=u]rohso; [=u]r (cf. AS. [=u]r) + ohso ox, G. ochs. Cf.
   Owre, Ox.] (Zool.)
   The European bison (Bison bonasus, or Bison Europ[ae]us),
   once widely distributed, but now nearly extinct, except where
   protected in the Lithuanian forests, and perhaps in the
   Caucasus. It is distinct from the Urus of C[ae]sar, with
   which it has often been confused.
   [1913 Webster]
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