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]