indigo blue

noun
1.
indigo ( def 4 ).
2.
Also called indigo, indigotin. a dark-blue, water-insoluble, crystalline powder, C 16 H 10 N 2 O 2 , 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:
1705–15

indigo-blue, adjective
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World English Dictionary
indigo blue
 
n, —adj
indigo the full name for indigo

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Guest rooms contain exposed brick, which makes the indigo blue colors and white deco-style lacquered furniture pop.
Recently killed specimens turn a bright indigo blue.
In late summer the leaves have died back leaving the stem upright with a cluster of indigo blue berries at the tip.
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