zubr /ˈzuːbə(ɹ)/ noun2 •A wisent, European bison (Bos bonasus).THE European bison, wisent or zubr (Bison bonasus) seems to be coming back into circulation again, at least among menagerie keepers. The London Zoo has a pair of them... — 1959 •(no longer used) One of several species of European bison or aurochs, which were unclearly delineated in the 1800s when this sense was in use. formszubrs