Part of speech: noun

A blue coloring substance obtained from the indigo plant; a deep violet blue.

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Usage examples "indigo":

  1. I however preferred to remain as I was; and many of the people slept around the tents upon heaps of indigo plant, making fires for themselves from the straw. - "Byeways in Palestine", James Finn.
  2. 1 cent, shades of indigo blue. - "History of the Postage Stamps of the United States of America", John Kerr Tiffany.
  3. Instantly the world becomes indigo. - "Two Years in the French West Indies", Lafcadio Hearn.