Definitions

from The Century Dictionary.

  • noun A resinous coloring matter (C7H6O2), isomeric with benzoic acid, existing in madder, and formed from rubian under the influence of acids or of a soluble ferment found in madder.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) One of the red dye products extracted from madder root, and probably identical with ruberythrinic acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry One of the red dye products extracted from madder root, probably identical with ruberythrinic acid.

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