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WordReference Random House Unabridged Dictionary of American English © 2024in′digo blue′, - indigo (def. 4).
- Also called indigo, indigotin. a dark-blue, water-insoluble, crystalline powder, C16H10N2O2, having a bronzelike luster, the essential coloring principle of which is contained along with other substances in the dye indigo and which can be produced synthetically.
in′di•go-blue′, adj.
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