dyeweed

/ˈdaɪˌwid/
noun
  1. A plant, especially one of the genus Reseda, used historically to produce a yellow dye.
    • She identified the wild plant as dyeweed because of its small yellow flowers.
    • Farmers once grew dyeweed in large fields to supply the textile industry.
    • The yellow color from dyeweed was popular for dyeing wool in medieval Europe.
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