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

  • n. Any of a group of organic bases forming unstable bluish or greenish salts and used in making dyes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any of a range of organic bases related to phenazine; they form indigo-coloured salts used in making dyes

from The Century Dictionary and Cyclopedia

  • n. A basic coal-tar color of unknown constitution, produced when nitroso-dimethyl-aniline hydrochlorid reacts with toluidine.


ind(igo) + amine.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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