sagebrushPronunciation: /ˈseɪdʒbrʌʃ/Definition of sagebrush noun [mass noun] a shrubby aromatic North American plant of the daisy family. Genus Artemisia, family Compositae: several species, in particular A. tridentata scrub which is dominated by sagebrush, occurring chiefly in semi-arid regions of western North America. sagebrush in other Oxford dictionaries Definition of sagebrush in the US English dictionary