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indigo
- a blue dye, CHNO, obtained from certain plants, esp. a plant (Indigofera tinctoria) native to India, or made synthetically, usually from aniline
- any of a genus (Indigofera) of plants of the pea family that yield indigo
- a deep violet blue, designated by Newton as one of the seven prismatic or primary colors
adjective
of this color
See indigo in American Heritage Dictionary 4
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