Origin: Latin suffix -al
Pennyroyal has 3 different meanings across 1 category:
Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil
erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
Mentha pulegium, a plant of the mint family, formerly much used in various medicinal treatments and as a flea repellent.