Wa·ter hore·hound Bot. Bugleweed.
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  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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  water horehound
       n : aromatic perennial herb of United States [syn: Lycopus
           americanus]