noun, plural bighorns (especially collectively) bighorn.
a wild sheep, Ovis canadensis, of the Rocky Mountains, with large, curving horns.

1775–85, Americanism; big1 + horn Unabridged


a river flowing from central Wyoming to the Yellowstone River in S Montana. 336 miles (540 km) long.

Bighorn Mountains

plural noun
a mountain range in N Wyoming, part of the Rocky Mountains. Highest peak, Cloud Peak, 13,165 feet (4013 meters).
Also called Bighorns. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bighorn (ˈbɪɡˌhɔːn)
n , pl -horns, -horn
a large wild sheep, Ovis canadensis, inhabiting mountainous regions in North America and NE Asia: family Bovidae, order Artiodactyla. The male has massive curved horns, and the species is well adapted for climbing and leaping

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Bighorn sheep and desert tortoises will lose habitat.
Figures resembling bighorn sheep crowd many petroglyph panels.
Get out your camera to photograph elk, deer, moose and bighorn sheep in their
  natural habitat.
Along the way on either hike you'll see plentiful wildflowers and may glimpse
  mountain goats or bighorn sheep.
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