n. pl. bison 1. A bovine mammal (Bison bison) of western North America, having large forequarters, a shaggy mane, and a massive head with short curved horns; a buffalo.
2. A bovine mammal (Bison bonasus) of Europe, similar to the American bison but with a somewhat smaller head and longer horns; a wisent.
3. The flesh of the American bison, used as food.