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 In·di·go a. 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.
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 In·di·go·gen n.
 1. Chem. See Indigo white, under Indigo.
 2. Physiol. Chem. Same as Indican, 2.
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