Source : Webster's Revised Unabridged Dictionary (1913)

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}.

Source : WordNet®

dyer's greenweed
     n : small Eurasian shrub having clusters of yellow flowers that
         yield a dye; common as weed in England and United States;
         sometimes grown as an ornamental [syn: {woodwaxen}, {dyer's-broom},
          {dyeweed}, {greenweed}, {whin}, {woadwaxen}, {Genista
         tinctoria}]