stinking horehound stin·king·ho·rehound uncommon noun 1. ill-smelling European herb with rugose leaves and whorls of dark purple flowers Synonymsblack horehoundblack archangelfetid horehoundstinking horehoundBallota nigra Related words Broader terms herb Parts Ballota WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
