Noun has 2 senses

• pennyroyal(n = noun.plant) mentha pulegium - Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil;



• pennyroyal(n = noun.plant) american pennyroyal, hedeoma pulegioides - erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine;