1. a climbing plant with small yellowish flowers, formerly used to make red dye
2. a red dye obtained from the madder plant

1. comparative form of mad; more angry or insane

Examples

• The ancient Romans used madder to dye their cloth red.
• Madder root was a valuable trade commodity in medieval times.
• The textile museum displayed fabrics colored with natural madder dye.
• She grew madder by the minute as the meeting dragged on.
• His behavior became madder and more erratic each day.
• The artist mixed madder with other pigments to create the perfect shade.