WordReference Random House Learner's Dictionary of American English © 2017
mad•der1 /ˈmædɚ/USA pronunciation   n. 
  1. Plant Biology[countable] a plant of Europe having clusters of small yellowish flowers.
  2. Plant Biology[uncountable] the root of this plant, once used in dyeing.
  3. [uncountable] a dye derived from madder.

WordReference Random House Unabridged Dictionary of American English © 2017
mad•der1  (madər),USA pronunciation n. 
  1. Plant Biologyany plant of the genus Rubia, esp. the climbing R. tinctorum, of Europe, having open clusters of small, yellowish flowers. Cf.  madder family. 
  2. Plant Biologythe root of this plant, formerly used in dyeing.
  3. Textilesthe dye or coloring matter itself.
  4. Textilesa color produced by such a dye.
  • bef. 1000; Middle English mad(d)er, Old English mæd(e)re; cognate with Old Norse mathra, Old High German matara

mad•der2  (madər),USA pronunciation adj. 
  1. comparative of  mad. 


Collins Concise English Dictionary © HarperCollins Publishers::

madder /ˈmædə/ n
  1. any of several rubiaceous plants of the genus Rubia, esp the Eurasian R. tinctoria, which has small yellow flowers and a red fleshy root
  2. the root of this plant
  3. a dark reddish-purple dye formerly obtained by fermentation of this root; identical to the synthetic dye, alizarin
  4. a red lake obtained from alizarin and an inorganic base; used as a pigment in inks and paints
Etymology: Old English mædere; related to Middle Dutch mēde, Old Norse mathra



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