[1] : The Collaborative International Dictionary of English v.0.48

madder \mad"der\ ma^d"d~er, n. oe. mader, as. maedere;
   akin to icel. maethra. 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.
   1913 webster

   note: madder is sometimes used in forming pigments, as lakes,
         etc., which receive their names from their colors, such
         as madder yellow.
         1913 webster

   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 munjeet.

   wild madder, rubia peregrina of europe; also the galium
      mollugo, a kind of bedstraw.
      1913 webster
see also:
rubia rubia tinctorum rubiaceous madder yellow field madder sherardia arvensis 
indian madder rubia cordifolia munjeet wild madder rubia peregrina 
galium mollugo 

Rubia >> R Words
Rubia, definition of term: Rubia
rubia_pag1.html

Rubia Tinctoria >> R Words
Rubia Tinctoria, definition of term: Rubia Tinctoria
rubia+tinctoria_pag1.html