1. Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin
   "Madder was historically crucial for producing red dyes";
   - Rubia tinctorum

1. Colour a moderate to strong red
   "The dyer maddered the fabric to achieve a rich, warm hue"

1. Affected with madness or insanity
   "a man who had gone mad";
   - brainsick [archaic], crazy [informal], demented, disturbed, unbalanced, unhinged
    
2. Roused to anger
   "she gets mad when you wake her up so early"; "mad at his friend";
   - huffy, sore
    
3. Marked by uncontrolled excitement or emotion
   "a mad whirl of pleasure";
   - delirious, excited, frantic, unrestrained
    
4. Very foolish
   "a completely mad scheme to build a bridge between two mountains";
   - harebrained [informal], insane

Derived forms: madders

See also: angry, cross, daft [Brit, informal], dumb, foolish, imbecile, imbecilic, insane, stupid, wild

Type of: madderwort, redden, rubiaceous plant

Encyclopedia: Madder, Leo