The Collaborative International Dictionary of English v.0.48:
Ruffed \Ruffed\, a.
Furnished with a ruff.
Ruffed grouse (Zool.), a North American grouse (Bonasa
umbellus) common in the wooded districts of the Northern
United States. The male has a ruff of brown or black
feathers on each side of the neck, and is noted for the
loud drumming sound he makes during the breeding season.
Called also tippet grouse, partridge, birch
partridge, pheasant, drummer, and white-flesher.
ruffed lemur (Zool.), a species of lemur (lemur varius)
having a conspicuous ruff on the sides of the head. Its
color is varied with black and white. Called also ruffed