Definitions

from The Century Dictionary.

  • noun A crystalline substance (C16H10N2O2) of a beautiful rose color, isomeric with indigo blue.

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

  • noun (Chem.) A dark red crystalline substance, isomeric with and resembling indigo blue, and obtained from isatide and dioxindol.

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

  • noun organic chemistry A dark red crystalline substance, isomeric with and resembling indigo blue, and obtained from isatide and dioxindol.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

indigo +‎ -in

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