Noun
- 1. pennyroyal, Mentha pulegium, mint
- usage: Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil
- 2. pennyroyal, American pennyroyal, Hedeoma pulegioides, herb, herbaceous plant
- usage: erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
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