名詞 pennyroyal:

1. Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil
   同義詞：Mentha pulegium
2. erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
   同義詞：American pennyroyal, Hedeoma pulegioides

pen.ny.roy.al

n.（名詞）
A Eurasian mint(Mentha pulegium) having small lilac-blue flowers and ovate or nearly orbicular leaves that yield a useful, aromatic oil.
薄荷：一種歐亞薄荷（唇萼薄荷 薄荷屬） ，長(zhǎng)有丁香紫藍(lán)色花朵和卵形或近似圓形的葉子，其葉子可生產(chǎn)出一種有用和芳香的油
An aromatic plant(Hedeoma pulegioides) of eastern North America, having purple-blue flowers and glabrous leaves that yield an oil used as an insect repellent.
穗花薄荷：一種生長(zhǎng)于北美東部有紫藍(lán)色花朵和無毛葉子的（穗花薄荷） 植物，其葉子可生產(chǎn)出一種用作驅(qū)蟲的油

來源：
Probably by folk etymology from Middle English puliol real
可能源自 中古英語 puliol real的民間詞源
from Anglo-Norman
源自 英法語
puliol [thyme] from Latin pôlegium
puliol [麝香草] 源自 拉丁語 pôlegium
real [royal] from Latin rôg3lis * see regal
real [皇家的] 源自 拉丁語 rôg3lis *參見 regal