gray sage gray·sage uncommon noun 1. low much-branched perennial of western United States having silvery leaves; an important browse and shelter plant Synonymssilver sagesilver sagebrushgray sageSeriphidium canumArtemisia cana Related words Broader terms sagebrush Parts Seriphidium WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.