Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A reddish crystalline compound, C14H5O2(OH)3, that is isolated from madder root for use as a biological stain and commercial dye.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A red anthraquinone dye, extracted from madder, that is used as a biological stain
  • n. A protein of the lipocalin family
  • n. A brownish or deep red decorative glass used in ancient times

from the GNU version of the Collaborative International Dictionary of English

  • n. A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.

from The Century Dictionary and Cyclopedia

  • n. A red coloring matter, C14H5O2(OH)3, used in dyeing, extracted from madder and prepared artificially by the oxidation of artificial alizarin.

Etymologies

Latin purpura, purple; see purple + -in.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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