fetid horehound(n = noun.plant) ballota nigra, black archangel, black horehound, stinking horehound - ill-smelling European herb with rugose leaves and whorls of dark purple flowers;
is a kind of herb, herbaceous plant
is a member of ballota, genus ballota

black horehound, common horehound, fetid, fetid bugbane, horehound, stinking horehound, water horehound, white horehound