What is the meaning of madder?

noun

• Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin.
  • synonyms: Rubia tinctorum

verb

• Color a moderate to strong red.

adjective

• Roused to anger.
  • usage: "stayed huffy a good while- Mark Twain; "she gets mad when you wake her up so early"; "mad at his friend"; "sore over a remark"
  • synonyms: huffy, mad, sore
• Affected with madness or insanity.
  • usage: "a man who had gone mad"
  • synonyms: brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged
• Marked by uncontrolled excitement or emotion.
  • usage: "a crowd of delirious baseball fans"; "something frantic in their gaiety"; "a mad whirl of pleasure"
  • synonyms: delirious, excited, frantic, mad, unrestrained
• Very foolish.
  • usage: "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains"
  • synonyms: harebrained, insane, mad