Noun pennyroyal oil has 2 senses
  1. pennyroyal oil - oil from European pennyroyal having a odor like mint; used chiefly in soaps
    --1 is a kind of
    oil
    --1 is a substance of pennyroyal, Mentha pulegium
  2. pennyroyal oil, hedeoma oil - aromatic oil from American pennyroyal
    --2 is a kind of oil
    --2 is a substance of pennyroyal, American pennyroyal, Hedeoma pulegioides
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