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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
[A.S. maedere]


Root of the plant Rubia tinctorum, a source of the red dye alizarin.

madder (maˑ·dr),

n Latin name:
Rubia tinctorum; part used: roots; uses: kidney stones, paralysis, menstrual problems, jaundice; precautions: pregnancy, lactation, children; possible hepatotoxicity. Also called
dyer's madder, garance, krapp, madder root, or
References in periodicals archive ?
Female familiar bluets typically leave their natal wetland to forage in surrounding uplands, whereas males tend to stay by the water, patrolling for females (Bick and Bick, 1963).
Ha (cm) RD (b) (%) Forbs Summer bluet (Hedyotis purpurea) 725 2.
4 Maggie Nelson, Bluets (Wave Books) File this lean tome under "color theory"--albeit a version of that strange genre that offers an intimate account of a color deeply imbued with bouts of loneliness, loss, lust, and unfixed wonder.
Wildflowers: galax, wood sorrel, woodland bluets, Canada mayflower, speckled wood lily, fly poison.
His company, Les Bluets Mistassini Ltee, sells fresh and frozen blueberries, and now cranberries, to customers in Canada and internationally.
Les Bluets Cotton Print, a traditional floral, is adapted from a 1774 Reveillon print and combines diamond patterning, delicate woven garlands and a pointillist background.
Lake Michigan smelled like arithmetic: fog trees, fog trees, bluets.
This formal conceit--for which Manguso is indebted to books like Maggie Nelson's Bluets and Jenny Ofill's Department of Speculation, among others--can seem to insist too heavily on its own profundity if one is not careful, and there are moments, here, when the writing does not live up to the manner in which it's delivered.
Tenders are invited for Biel path Bluets, travel pipes
My own far-from-perfect, never-to-be-advertised turf, upon close examination, reveals little populations of rogue plantains, dandelions, violets, moss, bluets, clover, ground ivy and a few other tiny species interspersed among spots of crabgrass and real lawn.
I start with the fact that Les Bluets (The cornflowers) is the painting I think of first when I think of one that has had particular significance in my life.