aurochs n.

"the domestic Bos taurus" (commonly meaning the castrated males, used to pull loads or for food), Middle English oxe, from Old English oxa "ox" (plural oxan), from Proto-Germanic *ukhson (source also of Old Norse oxi, Old Frisian oxa, Middle Dutch osse, Old Saxon, Old High German ohso, German Ochse, Gothic auhsa), from PIE *uks-en- "male animal," (source also of Welsh ych "ox," Middle Irish oss "stag," Sanskrit uksa, Avestan uxshan- "ox, bull"), said to be from root *uks- "to sprinkle," related to *ugw- "wet, moist." The animal word, then, is literally "besprinkler."

Also used from late Old English of the wild, undomesticated bovines. The black ox "misfortune, adversity, old age," etc., is by 1540s.

c. 1600, "European wild ox," from French bison (15c.), from Latin bison "wild ox," borrowed from Proto-Germanic *wisand- "aurochs" (source also of Old Norse visundr, Old High German wisunt "bison," Old English/Middle English wesend, which is not attested after c. 1400). Possibly ultimately of Baltic or Slavic origin, and meaning "the stinking animal," in reference to its scent while rutting (see weasel).

The animal formerly was widespread on the continent, including the British Isles, but in 20c. they survived in the wild only on a forest reserve in Poland. Not to be confused with the aurochs. The name also was applied 1690s to the North American species commonly mis-called a buffalo, which formerly ranged as far as Virginia and Georgia but by 1902 was deemed by Century Dictionary "apparently soon to become extinct as a wild animal." It has since recovered numbers on federal land. Related: Bisontine.