What does "heath" mean?

Heath: A place overgrown with heath; any cheerless tract of country overgrown with shrubs or coarse herbage. Their stately growth, though bare, Stands on the blasted heath. Milton Heath cock (Zoöl.), the blackcock. See Heath grouse (below). -- Heath grass (Bot.), a kind of perennial grass, of the genus Triodia (T. decumbens), growing on dry heaths. -- Heath grouse, or Heath game (Zoöl.), a European grouse (Tetrao tetrix), which inhabits heats; -- called also black game, black grouse, heath poult, heath fowl, moor fowl. The male is called, heath cock, and blackcock; the female, heath hen, and gray hen. -- Heath hen. (Zoöl.) See Heath grouse (above). -- Heath pea (bot.), a species of bitter vetch (Lathyris macrorhizus), the tubers of which are eaten, and in Scotland are used to flavor whisky. -- Heath throstle (Zoöl.), a European thrush which frequents heaths; the ring ouzel.