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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 ?
Camra newsletter editor Jim Witt (above) casts an expert eye over the contents of a glass while (left) Camra secretary Louise Madder pulls a pint and (right) Mick Madder prepares to sample a Fantasy brew.
SELL-OUT PHENOMENON: Mick Madder is expecting a capacity crowd at this year's real ale festival
PINTS OF DISTINCTION: Festival organisers Louise and Mick Madder.
GAMES companies' PR stunts seem to be getting madder by the day.
Organiser Michael Madder, of the Coventry and North Warwick-shire Branch of the Campaign for Real Ale, said: "We are expecting up to 1,000 people to visit over the two days, so we will be quite busy.
The more Johnson talked in the Forum catacombs, the madder he got.
I have never been madder in my life," said Turner, who originally threatened to boycott the event due to the increased ticket prices due to Wood's appearance.
Mick Madder, spokes-man for Coventry and North Warwickshire Camra, said: "The move to Highfield Road last year was a wonderful success.
Columnist Michael Dobbs of the London Daily Mail is madder than heck about the movie ``Titanic,'' ``the most expensive piece of inflammatory garbage ever served up.
Climaxing the highly successful Song Writers Festival with another capacity crowd, US band Madder Rose were definitely the odd ones out.
Mick Madder, spokesman for Coventry and North Warwickshire branch, said: "Less than 10 years' ago, there was not a single brewery in Warwickshire.
New York's mournful Madder Rose always aimed high, but sometimes had a hard time pulling off classic pop.