Rocky Mountain goat
noun
1.
a long-haired, white, antelopelike wild goat,
Oreamnos americanus,
of mountainous regions of western North America, having short, black horns.
Origin
1835-45,
Americanism
British Dictionary definitions for
Rocky Mountain goat
Rocky Mountain goat
noun
1.
a sure-footed goat antelope,
Oreamnos americanus
, inhabiting the Rocky Mountains. It has thick white hair and black backward-curving horns