madder

mad·der

noun \ˈmad-ər\

Definition of MADDER

1

: a Eurasian herb (Rubia tinctorum of the family Rubiaceae, the madder family) with whorled leaves, clusters of small yellowish flowers, and red to black berries; broadly : any of several related herbs (genus Rubia)

2

: the root of the Eurasian madder formerly used in dyeing; also : an alizarin dye prepared from it