GROUP GROUP'ED GROUP'ING GROUSE, noun grous. A heath-cock or cock of the wood, a fowl of the genus Tetrao. The name is given to several species, forming a particular division of the genus; such as the black game, the red game, the ptarmigan, the ruffed grouse, etc.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI