The Collaborative International Dictionary
dyer's greenweed
Woad-waxen \Woad"-wax`en\, n. [Cf. Wood-wax.] (Bot.) A leguminous plant ( Genista tinctoria) of Europe and Russian Asia, and adventitious in America; -- called also greenwood, greenweed, dyer's greenweed, and whin, wood-wash, wood-wax, and wood-waxen.
WordNet
Usage examples of "dyer's greenweed".
Blue used woad or indigo alone, and dark green was produced by overdyeing blue fabric with weld, dyer's greenweed or a similar yellow dye.