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–n.1. a blue dye that can be obtained from various plants. It is now usually made artificially, especially from aniline. »
The source of the world's indigo until the end of the nineteenth century was India, where over a million acres were set aside for the dye-producing plant (Atlantic).
2. a plant from which indigo was formerly obtained. Indigo belongs to the pea family.3. a deep violet-blue color, one of the seven prismatic or primary colors.4. = indigo blue (def. 2). (Cf. ↑indigo blue) Synthetic indigo is the same as indigotin, but natural indigo contains additional substances.–adj.deep violet-blue.╂[< Spanish índigo, and índico < Latin indicum < Greek indikón the blue Indian dye]
Useful english dictionary. 2012.