Definition of pennyroyal
1
: a European perennial mint (Mentha pulegium) with small aromatic leaves
2
: an aromatic North American mint (Hedeoma pulegioides) that has blue or violet flowers borne in axillary tufts and yields an oil used in folk medicine or to drive away mosquitoes
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Merriam-Webster unabridged
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Time Traveler for pennyroyal
The first known use of pennyroyal was in 1530
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