WordReference Random House Unabridged Dictionary of American English © 2020
herb Paris, pl.  herbs Paris. 
  1. Plant Biologya European plant, Paris quadrifolia, of the lily family, formerly used in medicine.
  • ?
  • Medieval Latin herba paris
  • 1560–70

Collins Concise English Dictionary © HarperCollins Publishers::
herb Paris n ( pl herbs Paris)
  1. a Eurasian woodland plant, Paris quadrifolia, with a whorl of four leaves and a solitary yellow flower: formerly used medicinally: family Trilliaceae
Etymology: 16th Century: from Medieval Latin herba paris, literally: herb of a pair: so called because the four leaves on the stalk look like a true lovers' knot; associated in folk etymology with Paris, France
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