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rattlesnake weed

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noun
  1. a hawkweed, Hieracium venosum, of eastern North America, whose leaves and root are thought to possess medicinal properties.
  2. a carrotlike weed, Daucus pusillus, of southern and western North America.
  3. any of certain other plants, as an umbelliferous plant, Eryngium aquaticum.
  4. rattlesnake plantain.
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Origin of rattlesnake weed

An Americanism dating back to 1750–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018