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• PENNYROYAL (noun) The noun PENNYROYAL has 2 senses: 1. Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil 2. erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine Familiarity information: PENNYROYAL used as a noun is rare.
