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Noun indigo has 3 senses
anil, indigo, indigotin - a blue dye obtained from plants or made synthetically--1 is a kind of dye, dyestuff
 
indigo, indigo plant, Indigofera tinctoria - deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye--2 is a kind of shrub, bush
 --2 is a member of Indigofera, genus Indigofera
 --2 has particulars: anil, Indigofera suffruticosa, Indigofera anil
 
indigo - a blue-violet color--3 is a kind of violet, reddish blue
 
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