• synonyms

indigo blue

  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.
Show More

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)
Show More
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