indigo blue

noun

indigo(def 4).
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

OTHER WORDS FROM indigo blue

in·di·go-blue, adjective

Words nearby indigo blue

indign, indignant, indignation, indignity, indigo, indigo blue, indigo bunting, indigo carmine, indigo snake, indigo squill, indigoid

British Dictionary definitions for indigo blue

indigo blue

noun, adjective (indigo-blue when prenominal)

the full name for indigo (def. 1), indigo (def. 3)