1. Oil from European pennyroyal having an odour like mint; used chiefly in soaps
   "Pennyroyal oil is sometimes used as an insect repellent, but can be toxic if misused"
    
2. Aromatic oil from American pennyroyal
   "pennyroyal oil was used in traditional folk remedies";
   - hedeoma oil

Type of: oil

Part of: American pennyroyal, Hedeoma pulegioides, Mentha pulegium, pennyroyal