|noun|
1.a blue dye made artificially or obtained especially formerly from plants (
2.a deep purplish blue
3.a blue dye obtained from indigo plants (as Indigofera tinctoria of Africa and India, I. anil of South America, and I. auriculata of Arabia and Egypt)
4.the principal coloring matter C16H10N2O2 of natural indigo usually synthesized as a blue powder with a coppery luster — called also indigotin
5.indigo plant
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