- a strongly scented, perennial European mint (Mentha pulegium) with bluish-lavender flowers
- a similar North American mint (Hedeoma pulegioides) that yields an aromatic oil
Origin of pennyroyalaltered from earlier pulyol ryal from Anglo-French puliol real from Old French poliol, pouliol ( from Classical Latin puleium: influenced, influence by associated, association with pulegium, fleabane from uncertain or unknown; perhaps ) + real, royal
- A Eurasian mint (Mentha pulegium) having small lilac-blue flowers and ovate or nearly orbicular leaves that yield an essential oil formerly used medicinally and as an insect repellent.
- An aromatic eastern North American mint (Hedeoma pulegioides) having purple-blue flowers and lanceolate to ovate leaves that yield a similar essential oil.
Origin of pennyroyalProbably by folk etymology from Middle English puliol real from Anglo-Norman puliol thyme ( from Latin pūlegium ) real royal ( from Latin rēgālis ; see regal . )