Noun american pennyroyal has 1 sense
  1. pennyroyal, American pennyroyal, Hedeoma pulegioides - erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
    --1 is a kind of herb, herbaceous plant
    --1 is a member of Hedeoma, genus Hedeoma
    --1 has substances: pennyroyal oil, hedeoma oil
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