indigo blue

American  

noun

1. indigo.

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 British  

noun

1. the full name for indigo indigo

---

Other Word Forms

• indigo-blue adjective

Etymology

Origin of indigo blue

First recorded in 1705–15

Example Sentences

I also found an indigo blue kimono to wear at an art event later this year.

From Los Angeles Times • Feb. 20, 2026

Models showcased dresses in indigo blue, on a deep blue catwalk under the cavernous reinforced concrete dome of the futuristic building designed by Brazilian architect Oscar Niemeyer.

From Reuters • Sep. 25, 2023

With cyanotypes, also called sun prints, your leaf makes a white silhouette on photo-chemical-treated paper or fabric that turns the deepest indigo blue.

From Seattle Times • Sep. 15, 2023

Leather skins lie on the roofs, drying in the sun and men expertly step in and out of the circular vats of dye: turmeric yellow, indigo blue and poppy red.

From The Guardian • Apr. 28, 2019

There are a hundred kinds of grass out there, grasses as yellow as lemon and as dark as indigo, blue grasses and orange grasses and grasses like rainbows.

From "A Game of Thrones" by George R.R. Martin