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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]