indigo

UK: /ˈɪndɪgəʊ/ US: /ˈɪndɪˌgoʊ/ ,(in′di gō′)

Inflections of 'indigo' (n):

indigos

npl

indigoes

npl

WordReference Random House Learner's Dictionary of American English © 2026

in•di•go /ˈɪndɪˌgoʊ/   n. 

[uncountable]
1. a blue dye obtained from various plants.
2. a deep violet blue color.

adj. 

3. of the color indigo.

WordReference Random House Unabridged Dictionary of American English © 2026

in•di•go  (in′di gō′), n., pl. -gos, -goes, adj. 
n. 

1. a blue dye obtained from various plants, esp. of the genus Indigofera, or manufactured synthetically.
2. See indigo blue (def. 2).
3. Plant Biology any of numerous hairy plants belonging to the genus Indigofera, of the legume family, having pinnate leaves and clusters of usually red or purple flowers.
4. a color ranging from a deep violet blue to a dark, grayish blue.

adj. 

5. Also called indigo-blue, indigotic. of the color indigo.

• Greek indikón, noun, nominal use of neuter of Indikós Indic
• Latin indicum
• Spanish or Portuguese, variant of índico
• 1545–55

Collins Concise English Dictionary © HarperCollins Publishers::

indigo / ˈɪndɪˌɡəʊ/ noun ( -gos, -goes)

1. Also called: indigotin a blue vat dye originally obtained from plants but now made synthetically
2. any of various tropical plants of the leguminous genus Indigofera, such as the anil, that yield this dye
3. any of a group of colours that have the same blue-violet hue; a spectral colour
4. (as adjective): an indigo carpet

Etymology: 16th Century: from Spanish indico, via Latin from Greek Indikos of India

indigotic / ˌɪndɪˈɡɒtɪk/ adjective