noun

• Either of two small-leaved plants of the mint family, used in herbal medicine.

  A creeping Eurasian plant (Mentha pulegium), and American pennyroyal (Hedeoma pulegioides), family Labiatae

  ‘Mint, lemon balm, pennyroyal, chives, chamomile, mayflower, and summer savory are a few herbs perfectly suited to this microclimate.’

  More example sentences

  • ‘This also is true of many herbal tablets, capsules and extracts, including black or blue cohosh, ephedra, dong quai, feverfew, juniper, pennyroyal, St. John's wort, rosemary and thuja.’
  • ‘Essential oils from allspice, basil, cedar, cinnamon, citronella, garlic, geranium, lavender, pennyroyal, peppermint, pine, rosemary, and thyme have been reported to have repellent properties.’
  • ‘Some herbs that repel fleas include: juniper, pennyroyal, citronella, eucalyptus, cedar and Canadian fleabane.’
  • ‘Herbal flea collars containing essential oils such as pennyroyal, eucalyptus and citronella can also prevent fleas and ticks from landing on your pet.’
  • ‘For some reason it always showed up in the potted garden and it particularly liked rooming with the pennyroyal.’
  • ‘Some herbal treatments, such as citrus extracts or pennyroyal, can be toxic to pets and humans.’
  • ‘These include pennyroyal (fatal if ingested), tea tree, rosemary and eucalyptus oils.’
  • ‘Then there's pennyroyal, a name for the mint Menthe pulegium, once prized as a medicinal herb.’
  • ‘Safflower is simply a safe cooking oil, but pennyroyal is known to have potential abortive effects.’