"indigo" in the noun sense
1. anil, indigo, indigotin
a blue dye obtained from plants or made synthetically
2. 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
a blue-violet color
"indigo" in the adjective sense
having a color between blue and violet
Source: WordNet® (An amazing lexical database of English)
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