Etymology
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madder (n.)

type of plant (in modern use Rubia tinctorum) yielding a valuable dyestuff, Old English mædere and Old Norse maðra, from PIE *modhro- "dye plant" (source also of Old High German matara "madder," Polish modry, Czech modry "blue").

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Definitions of madder
1
madder (v.)
color a moderate to strong red;
2
madder (n.)
Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin;
Synonyms: Rubia tinctorum
From wordnet.princeton.edu