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Definition of indigo:

  1. A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper- violet luster when rubbed. Indigo does not exist in the plants as such, but is obtained by decomposition of the glycoside indican.
  2. A kind of deep blue, one of the seven prismatic colors.
  3. Having the color of, pertaining to, or derived from, indigo.


indigo plant, anil, indigotin, Indigofera tinctoria.

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