| n. | 1. | (Bot.) An aromatic herb (Mentha Pulegium) of Europe; also, a North American plant (Hedeoma pulegioides) resembling it in flavor.
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| Noun | 1. | pennyroyal - Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oilSynonyms: Mentha pulegium |
| 2. | pennyroyal - erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicineSynonyms: American pennyroyal, Hedeoma pulegioides |