Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun pennyroyal

2 senses of pennyroyal

Sense 1
pennyroyal, Mentha pulegium -- (Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil)
       => mint -- (any north temperate plant of the genus Mentha with aromatic leaves and small mauve flowers)

Sense 2
pennyroyal, 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)
       => herb, herbaceous plant -- (a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests)