pennyroyal

Apparently an alteration (after penny) of Anglo-Norman puliol royal, from Latin pūlegium.

• (UK) IPA^(key): /pɛnɪˈɹɔɪəl/

pennyroyal (plural pennyroyals)

1. Mentha pulegium, a plant of the mint family, formerly much used in various medicinal treatments and as a flea repellent.
   • 1653, Nicholas Culpeper, The English Physician Enlarged, Folio Society 2007, p. 216:

     Dioscorides says that Pennyroyal makes thin, tough phlegm, warms the coldness of any part whereto it is applied, and digests raw or corrupt matter.

• (species): European pennyroyal, pennyrile, pudding grass, mosquito plant, squaw mint

• American pennyroyal, American false pennyroyal
• savin
• tansy