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sneezeweed

[sneez-weed]
noun
  1. any of several coarse composite plants of the genus Helenium, the flowers of which resemble sunflowers and cause sneezing.
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Origin of sneezeweed

First recorded in 1830–40; sneeze + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018