Pennyroyal meaning

pĕn'ē-roi'əl
A Eurasian mint (Mentha pulegium) having small lilac-blue flowers and ovate or nearly orbicular leaves that yield an essential oil formerly used medicinally and as an insect repellent.
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An aromatic eastern North American mint (Hedeoma pulegioides) having purple-blue flowers and lanceolate to ovate leaves that yield a similar essential oil.
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A strongly scented, perennial European mint (Mentha pulegium) with bluish-lavender flowers.
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A similar North American mint (Hedeoma pulegioides) that yields an aromatic oil.
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Mentha pulegium, a plant of the mint family, formerly much used in various medicinal treatments and as a flea repellant.
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Origin of pennyroyal

  • Probably by folk etymology from Middle English puliol real from Anglo-Norman puliol thyme (from Latin pūlegium) real royal (from Latin rēgālis regal)
    From American Heritage Dictionary of the English Language, 5th Edition
  • Apparently an alteration (after penny) of Anglo-Norman puliol royal, from Latin pulegium.
    From Wiktionary