Hore·hound n.  Bot.
  1. A plant of the genus Marrubium (Marrubium vulgare), which has a bitter taste, and is a weak tonic, used as a household remedy for colds, coughing, etc. [Written also hoarhound.]
  Fetid horehound, or Black horehound, a disagreeable plant resembling horehound (Ballota nigra).
  Water horehound, a species of the genus Lycopus, resembling mint, but not aromatic.
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  Ballota nigra
       n : ill-smelling European herb with rugose leaves and whorls of
           dark purple flowers [syn: black horehound, black
           archangel, fetid horehound, stinking horehound]