A low irregular shrub (Artemisia tridentata), of the order Compositæ, covering vast tracts of the dry alkaline regions of the American plains; -- called also sagebush, and wild sage. [1913 Webster]
sagebrush, n.
1 a growth of shrubby aromatic plants of the genus Artemisia, esp. A. tridentata, found in some semi-arid regions of western N. America.
2 this plant.