Definitions for sage grouse
Random House Webster's College Dictionary
a large grouse, Centrocercus urophasianus, of the sagebrush regions of W North America, with a black belly patch and a long, pointed tail.
Origin of sage grouse:
sage grouse, sage hen, Centrocercus urophasianus(noun)
large grouse of sagebrush regions of North America
A large grouse of western North America having mottled gray, black and buff plumage (Centrocercus urophasianus) which feeds on the buds of the sagebrush.