Marrubium vulgare

from WordNet (r) 3.0 (2006)

Marrubium vulgare
    n 1: European aromatic herb with hairy leaves and numerous white
         flowers in axillary cymes; leaves yield a bitter extract
         use medicinally and as flavoring [syn: {common horehound},
         {white horehound}, {Marrubium vulgare}]

from The Collaborative International Dictionary of English v.0.48

Horehound \Hore"hound`\, n. [OE. horehune, AS. h[=a]rhune;
   h[=a]r hoar, gray + hune horehound; cf. L. cunila a species
   of organum, Gr. ?, Skr. kn?y to smell.] (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}.]
      [1913 Webster]

   2. A lozenge or tablet, usually sweetened, containing extract
      of horehound, used as a remedy for a cough or a sore
      throat.
      [PJC]

   {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.
      [1913 Webster]