Definition of pennyroyal in English:



  • 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.’
    • ‘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.’



/ˌpenēˈroi(ə)l/ /ˌpɛniˈrɔɪ(ə)l/


Mid 16th century from Anglo-Norman French puliol (based on Latin pulegium ‘thyme’) + real ‘royal’.