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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Pen·ny·roy·al n.  Bot. An aromatic herb (Mentha Pulegium) of Europe; also, a North American plant (Hedeoma pulegioides) resembling it in flavor.
 Bastard pennyroyal Bot. See Blue curls, under Blue.
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From: WordNet (r) 2.0

 Hedeoma pulegioides
      n : erect hairy branching American herb having purple-blue
          flowers; yields an essential oil used as an insect
          repellent and sometimes in folk medicine [syn: pennyroyal,
           American pennyroyal]