dyer's broom \dyer's broom\, dyer's-broom \dyer's-broom\n. small Eurasian shrub ({Genista tinctoria}) having clusters of yellow flowers that yield a dye; common as weed in England and U.S.; sometimes grown as an ornamental. Syn: woodwaxen, dyer's greenweed, dyer's weed, dyer's rocket, dyeweed, greenweed, whin, woadwaxen, {Genista tinctoria}. [WordNet 1.5]