pennyroyal oil
noun
: a yellowish aromatic essential oil obtained from an American pennyroyal (Hedeoma pulegioides) and used as an insect repellent and in folk medicine as an emmenagogue, carminative, and stimulant
called also hedeoma oil
Cite this Entry
“Pennyroyal oil.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pennyroyal%20oil. Accessed 29 Nov. 2025.
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