One of the mysteries of the English language finally explained.
Either of two small-leaved plants of the mint family, used in herbal medicine.
- ‘Essential oils from allspice, basil, cedar, cinnamon, citronella, garlic, geranium, lavender, pennyroyal, peppermint, pine, rosemary, and thyme have been reported to have repellent properties.’
- ‘Safflower is simply a safe cooking oil, but pennyroyal is known to have potential abortive effects.’
- ‘Mint, lemon balm, pennyroyal, chives, chamomile, mayflower, and summer savory are a few herbs perfectly suited to this microclimate.’
- ‘Herbal flea collars containing essential oils such as pennyroyal, eucalyptus and citronella can also prevent fleas and ticks from landing on your pet.’
- ‘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.’
- ‘For some reason it always showed up in the potted garden and it particularly liked rooming with the pennyroyal.’
- ‘Some herbs that repel fleas include: juniper, pennyroyal, citronella, eucalyptus, cedar and Canadian fleabane.’
- ‘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.’
Mid 16th century: from Anglo-Norman French puliol (based on Latin pulegium ‘thyme’) + real ‘royal’.
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