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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 ?
Mr Madders insists: "I am committed to doing everything I can to keep the plant open.
It's been a tale of two elections - the one Theresa May wanted to be about Brexit and one that highlighted the massive unfairness in our society," said Mr Madders.
Mr Madders travelled up to the region last week and met with members of the NFU North-West Livestock Board, chaired by Alistair Mackintosh, of Ravenglass in Cumbria.
Madders was directing his side well from scrum-half as the visitors enjoyed their best spell of the game and when hooker Luke Brookes crossed on 55 minutes the game looked set for an exciting final quarter.
Investing in clean energy technologies on campus can help reduce energy bills, decrease emissions and demonstrate leadership in research and innovation," Ms Madders said.
Labour MPs Greenwood Madders Wirral West MP Margaret Greenwood said that the closure of Arrowe Park and Clatterbridge would be "devastating".
The bodies of wildlife expert Dr Michael Madders, 52, and son Daniel were recovered by helicopter from Loch Maree at Wester Ross in the Northwest Highlands following Sunday's tragedy.
Michael Madders, 52, and his son Daniel were both wearing lifejackets when they were found by a coastguard helicopter and taken to the Western Isles Hospital in Stornoway.
CAPSIZED: Michael Madders, who has been named as the man who drowned along with his son Daniel, in a canoe accident on a Highland loch
CRADLEY Town boss Trevor Thomas has brought in much-travelled Paul Madders to help the Beeches View Avenue outfit in their bid to beat the drop.