[big-hawrn] 
) -horn. | a wild sheep, Ovis canadensis, of the Rocky Mountains, with large, curving horns. |
| big·horn (bĭg'hôrn') n. pl. bighorn or big·horns A wild sheep (Ovis canadensis) of the mountains of western North America, the male of which has massive curved horns. Also called mountain sheep, Rocky Mountain sheep. |
| Rocky Mountain sheep n. See bighorn. |