A plant of the genus Rubia (R. tinctorum). The root is much used in dyeing red, and formerly was used in medicine. It is cultivated in France and Holland. See Rubiaceous.
- A southwest Asian perennial plant (Rubia tinctorum) having small yellow flowers, whorled leaves, and a red root.
- The root of this plant, formerly an important source of the dye alizarin.
- A red dye obtained from the roots of this plant.
- A medium to strong red or reddish orange.