from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A monoterpenoid ketone, found in pennyroyal, that is toxic to dogs and cats

from The Century Dictionary and Cyclopedia

  • n. An oily unsaturated ketone related to the terpenes, , found in the oils of Spanish and American pennyroyal (Mentha Pulegium and Hedeoma pulegioides), etc. It has an odor resembling peppermint.


Sorry, no etymologies found.


  • Its concentration increases with the age of the leaf, so older leaves taste more cooling; hot and dry growing conditions cause menthol to be transformed into a noncooling, somewhat harsh by-product pulegone, the characteristic volatile in pennyroyal.

    On Food and Cooking, The Science and Lore of the Kitchen


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