Definition of madders:
(n) :
A dye made from the plant.
(n) :
A herbaceous plant, Rubia tinctorum, native to Asia, cultivated for a red-purple dye (alizarin) obtained from the root.
(n) :
The root of the plant, used as a medicine or a dye.
(n) :
A deep reddish colour, like that of the dye.
(adj) :
Of a deep reddish purple colour, like that of the dye.
(v) :
(transitive, rare) To dye with madder.