The Collaborative International Dictionary
Bonassus
Bonasus \Bo*na"sus\, Bonassus \Bo*nas"sus\, n. [L. bonasus, Gr. ?, ?.] (Zo["o]l.) The aurochs or European bison. See Aurochs. [1913 Webster] ||
Wiktionary
bonassus
n. 1 A bonnacon. 2 The aurochs, or European bison.