{Ruffed grouse} (Zo["o]l.), 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} (Zo["o]l.), 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 maucaco}.
2. (Mil.) To beat with the ruff or ruffle, as a drum.
3. (Hawking) To hit, as the prey, without fixing it.