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Dictionary

in'digo blue'

1. indigo (def. 4).
2. 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

indigo

indigo bunting

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