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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.
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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)
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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