black horehound

n.
A Eurasian perennial herb (Ballota nigra) in the mint family, having hairy, strong-smelling foliage and clusters of pinkish-purple flowers.

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The noun has one meaning:

Meaning #1: ill-smelling European herb with rugose leaves and whorls of dark purple flowers
  Synonyms: black archangel, fetid horehound, stinking horehound, Ballota nigra

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