plural indigos or indigoes
Definition of indigo
1 : a deep reddish blue
2 : indigo plant
3a : a blue vat dye obtained from plants (such as indigo plants)
b : the principal coloring matter C16H10N2O2 of natural indigo usually synthesized as a blue powder with a coppery luster
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Time Traveler for indigo
The first known use of indigo was in 1555
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