dyer's rocket

n.
A European plant (Reseda luteola) having long spikes of small, yellowish-green flowers and yielding a yellow dye. Also called weld.

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The noun has one meaning:

Meaning #1: European mignonette cultivated as a source of yellow dye; naturalized in North America
  Synonyms: dyer's mignonette, weld, Reseda luteola

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