Pronunciation: (mad'ur),[key] —n. 1. any plant of the genus Rubia, esp. the climbing R. tinctorum, of Europe, having open clusters of small, yellowish flowers. Cf. madder family. 2. the root of this plant, formerly used in dyeing.
3. the dye or coloring matter itself.
4. a color produced by such a dye.
Pronunciation: (mad'ur),[key] —adj. comparative of mad.