The male of the heath-bird, n. or Black Grouse (Tetrao tetrix), the Blackcock; in North America, the Canada grouse and other species.

With plural agreement: black grouse, Tetrao tetrix, collectively. Also (with singular agreement): the species itself.

A large grouse of northern Eurasia, Tetrao tetrix (family Tetraonidae), the male of which is chiefly glossy black with a lyre-shaped tail, noted for…

= heath-bird, n.; more spec. the female or young.

A bird which lives on heaths; spec. the Black Grouse, of which the male is the heath-cock, n. and the female the heath-hen, n.

(a) the red grouse, Lagopus lagopus; (b) the black grouse, Tetrao tetrix (rare).