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.

indigo blue

noun

1. the full name for indigo indigo

Other Words From

• indi·go-blue adjective

Word History and Origins

Origin of indigo blue¹

First recorded in 1705–15

Example Sentences

I have seen coloring as remarkable—I had almost said as unnatural—as that indigo blue which we connect with the Ægean sea.

From Project Gutenberg

Litmus-paper, indigo blue or other vegetable colours are at once bleached.

From Project Gutenberg

In the middle the lake's depth is fifteen hundred feet and the water is a dark indigo-blue.

From Project Gutenberg

The metallic sheen of the head of the ring-neck is a dark indigo blue.

From Project Gutenberg

Male, indigo blue; female, brownish but usually with a faint indication of blue on the wings or tail.

From Project Gutenberg