Seriphidium tridentatum se·rip·hi·diumtridentatum uncommon noun 1. aromatic shrub of arid regions of western North America having hoary leaves Synonymsbig sagebrushblue sageSeriphidium tridentatumArtemisia tridentata Related words Broader terms sagebrush Parts Seriphidium WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.