Madder definitions

măd'ər
Designating a family (Rubiaceae, order Rubiales) of chiefly tropical, dicotyledonous herbs, shrubs, and trees, including bedstraw, bluet, coffee, and cinchona.
adjective
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adjective
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Any of a genus (Rubia) of plants of the madder family, with petals fused to form a funnel-shaped corolla; esp., a perennial vine (R. tinctorum) with panicles of small, yellow flowers.
noun
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Bright red; crimson.
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Any of several plants of the genus Rubia, especially R. tinctorum of Eurasia, having small yellow flowers, whorled leaves, and a reddish-brown root.
noun
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A medium to strong red or reddish orange.
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A herbaceous plant, Rubia tinctorum, native to Asia, cultivated for a red-purple dye obtained from the root.
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Of a deep reddish purple colour, like that of the dye.
adjective
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The root of the plant, used as a medicine or a dye.
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Comparative form of mad: more mad.
adjective
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The root of R. tinctorum, formerly an important source of the dye alizarin.
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A red dye obtained from these roots.
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The red root of this vine.
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A red dye made from this.
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A dye made from the plant.
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A deep reddish purple colour, like that of the dye.

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Obsolete form of mether.
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Origin of madder

Old English mæddre, mædre, from Germanic, perhaps from an Indo-European base meaning "blue." Cognate with Swedish madra.