Definition of Indigo

1. Noun. A blue dye obtained from plants or made synthetically.

Exact synonyms: Anil, Indigotin
Generic synonyms: Dye, Dyestuff

2. Adjective. Having a color between blue and violet. "Indigo flowers"
Similar to: Colored, Colorful, Coloured

3. Noun. Deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye.
Exact synonyms: Indigo Plant, Indigofera Tinctoria
Group relationships: Genus Indigofera, Indigofera
Specialized synonyms: Anil, Indigofera Anil, Indigofera Suffruticosa
Generic synonyms: Bush, Shrub

4. Noun. A blue-violet color.
Generic synonyms: Reddish Blue, Violet

Definition of Indigo

1. n. A kind of deep blue, one of the seven prismatic colors.

2. a. Having the color of, pertaining to, or derived from, indigo.

Definition of Indigo

1. Noun. A purplish-blue colour ¹

2. Noun. A blue dye obtained from certain plants (the indigo plant or woad), or a similar synthetic dye. ¹

3. Adjective. Having a deep blue colour. ¹

¹ Source:

Definition of Indigo

1. a blue dye [n -GOS or -GOES]

Medical Definition of Indigo

1. Origin: F. Indigo, Sp. Indigo, indico, L. Indicum indigo, fr. Indicus Indian. See Indian. 1. A kind of deep blue, one of the seven prismatic colours. 2. A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper-violet luster when rubbed. Indigo does not exist in the plants as such, but is obtained by decomposition of the glycoside indican. Commercial indigo contains the essential colouring principle indigo blue or indigotine, with several other dyes; as, indigo red, indigo brown, etc, and various impurities. Indigo is insoluble in ordinary reagents, with the exception of strong sulphuric acid. Chinese indigo, the American herb Baptisia tinctoria which yields a poor quality of indigo, as do several other species of the same genus. Having the colour of, pertaining to, or derived from, indigo. Indigo berry, the gopher snake. Indigo white, a white crystalline powder obtained by reduction from indigo blue, and by oxidation easily changed back to it; called also indigogen. Indigo yellow, a substance obtained from indigo. Source: Websters Dictionary (01 Mar 1998)

Indigo Pictures

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Lexicographical Neighbors of Indigo

indigo (current term)
indigo bird
indigo blue
indigo broom
indigo bunting
indigo buntings
indigo carmine
indigo finch
indigo plant
indigo snake
indigo squill

Literary usage of Indigo

Below you will find example usage of this term as found in modern and/or classical literature:

1. Methods of Practical Hygiene by Karl Bernhard Lehmann (1893)
"the number of cubic centimetres of the indigo solution which have been consumed, and begins at once a second titration in the same manner, ..."

2. A Dictionary of Arts, Manufactures, and Mines: Containing a Clear Exposition by Andrew Ure (1844)
"Creosote has the property of dissolving indigo. indigo is a mixture of several ... indigo gluten or gliadine is dissolved along with the calcareous and ..."

3. A Dictionary of Chemistry and the Allied Branches of Other Sciences by Henry Watts (1865)
"According to Berzelius, the indigo-white is oxidised, and part of the sulphuric acid ... When exposed to the air, they immediately deposit indigo-blue. ..."

4. The Imperial Gazetteer of India by William Wilson Hunter (1886)
"In 1877-78, the total export of indigo from all India was indigo 120605 cwts., ... In Bengal, indigo is usually grown on low-lying lands, with System of ..."

5. Report of the Annual Meeting (1865)
"It was remarkable, however, that indigo very rarely appeared to be eliminated directly from the body in its markedly blue colour. ..."

6. Allen's Commercial Organic Analysis: A Treatise on the Properties, Modes of by Alfred Henry Allen (1917)
"If it is desired to estimate the indigo by titration instead of by direct weighing, the precipitate is collected on a Gooch crucible, the bottom1 of which ..."

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