madder(redirected from madderwort)
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1. The dried and powdered root of Rubia tinctorum (family Rubiaceae); it contains several glycosides that produce the red dyes alizarin and purpurin on fermentation. When madder (or alizarin) is fed to young animals, the calcium in newly deposited bone salt, hydroxyapatite, is stained red.
2. Any dye obtained from plants of the madder family (Rubiaceae).
Synonym(s): Turkey red
Farlex Partner Medical Dictionary © Farlex 2012
Root of the plant Rubia tinctorum, a source of the red dye alizarin.
Medical Dictionary, © 2009 Farlex and Partners