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Indigo   /ˈɪndəgˌoʊ/  /ˈɪndɪgˌoʊ/   Listen
noun
Indigo  n.  (pl. indigoes)  
1.
A kind of deep blue, one of the seven prismatic colors.
2.
(Chem.) A blue dyestuff obtained from several plants belonging to very different genera and orders, such as, the woad, Isatis tinctoria (family Cruciferae), Indigofera suffroticosa, Indigofera tinctoria (family Leguminosae), Indigofera Anil, Nereum tinctorium, Polygonum tinctorium Ait. (family Polygonaceae), etc.; called also natural indigo. 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. Note: Commercial indigo contains the essential coloring 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 (Bot.), Isatis indigotica, a kind of woad.
Wild indigo (Bot.), the American herb Baptisia tinctoria which yields a poor quality of indigo, as do several other species of the same genus.


adjective
Indigo  adj.  Having the color of, pertaining to, or derived from, indigo.
Indigo berry (Bot.), the fruit of the West Indian shrub Randia aculeata, used as a blue dye.
Indigo bird (Zool.), a small North American finch (Cyanospiza cyanea). The male is indigo blue in color. Called also indigo bunting.
Indigo blue.
(a)
The essential coloring material of commercial indigo, from which it is obtained as a dark blue earthy powder, with a reddish luster, C16H10N2O2, which may be crystallized by sublimation. Indigo blue is also made from artificial amido cinnamic acid, and from artificial isatine; and these methods are of great commercial importance. Called also indigotin.
(b)
A dark, dull blue color like the indigo of commerce.
Indigo brown (Chem.), a brown resinous substance found in crude indigo.
Indigo copper (Min.), covellite.
Indigo green, a green obtained from indigo.
Indigo plant (Bot.), a leguminous plant of several species (genus Indigofera), from which indigo is prepared. The different varieties are natives of Asia, Africa, and America. Several species are cultivated, of which the most important are the Indigofera tinctoria, or common indigo plant, the Indigofera Anil, a larger species, and the Indigofera disperma.
Indigo purple, a purple obtained from indigo.
Indigo red, a dyestuff, isomeric with indigo blue, obtained from crude indigo as a dark brown amorphous powder.
Indigo snake (Zool.), 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.





Collaborative International Dictionary of English 0.48


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"Indigo" Quotes from Famous Books



... and his nekke is zalowe, aftre colour of an orielle, [Footnote: Golden. From Latin, Aurea. Cf. Oriel College, Golden Hall.] that is a ston well schynynge; and his bek is coloured blew, as ynde; [Footnote: Indigo.] and his wenges ben of purple colour, and the Taylle is zelow and red, castynge his taylle azens in travers. And he is a fulle fair brid to loken upon, azenst the sonne: for he schynethe ...
— The Principal Navigations, Voyages, Traffiques and Discoveries - of the English Nation. v. 8 - Asia, Part I. • Richard Hakluyt
... East Indies, has come to this country at the instance of our minister in London, for the purpose of bringing before us the subject of introducing some twenty of the most valuable agricultural staples of the East, among which are the tea, coffee, and indigo plants, into the United States. He gives his reasons for believing that tea and indigo would become articles of export from this country to an amount greater than the whole of our present exports. He says that tea, for which we now pay from sixty-five ...
— The International Monthly Magazine - Volume V - No II • Various
... was a country, more beautiful than all other lands and the castle of the Duke, its ruler, lay beside a lake that was bluer than the deepest indigo. A long time ago the Knight Wendelin and his squire George chanced upon this lake, but they found nothing save waste fields and bleak rocks around it, yet the shores must formerly have borne a different aspect, for there were shattered columns and broken-nosed statues lying on the ground. Against ...
— Uarda • Georg Ebers
... between the birds of the East and those of the West. Why does the hardy and almost ubiquitous blue jay studiously avoid the western plains and mountains? Why do not the magpie and the long-crested jay come east? What is there that prevents the indigo-bird from taking up residence in Colorado, where his pretty western cousin, the lazuli finch, finds himself so much at home? Why is the yellow-shafted flicker of the East replaced in the West by the red-shafted flicker? These questions are more easily asked than ...
— Birds of the Rockies • Leander Sylvester Keyser
... pigments mentioned above — black, red, and white, made respectively from soot, iron oxide, and lime — are, so far as we know, the only native varieties; but at the present day these are sometimes supplemented with indigo and yellow pigments obtained from the bazaars. The pigment is generally laid on free-hand with the finger-tip, a few guiding ...
— The Pagan Tribes of Borneo • Charles Hose and William McDougall


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