Mad"der(md"dr), n. [OE. mader, AS. mdere; akin to Icel. mara.] (Bot.) A plant of the genus Rubia (Rubia tinctorum). The root is much used in dyeing red, and formerly was used in medicine. It is cultivated in France and Holland. See Rubiaceous.
Madder is sometimes used in forming pigments, as lakes, etc., which receive their names from their colors, such as madder yellow.
Field madder, an annual European weed (Sherardia arvensis) resembling madder. --
Indian madder , the East Indian Rubia cordifolia, used in the East for dyeing; -- called also
Wild madder, Rubia peregrina of Europe; also the Galium Mollugo, a kind of bedstraw.
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Wed 12th December 2018