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indigo blue

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noun
  1. indigo(def 4).
  2. Also called indigo, indigotin. a dark-blue, water-insoluble, crystalline powder, C16H10N2O2, having a bronzelike luster, the essential coloring principle of which is contained along with other substances in the dye indigo and which can be produced synthetically.

Origin of indigo blue

First recorded in 1705–15
Related formsin·di·go-blue, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for indigo blue

indigo blue

noun, adjective (indigo-blue when prenominal)
  1. the full name for indigo (def. 1), indigo (def. 3)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012