Chapter Indicatory to Indigo of I by Webster's Dictionary (1913 Edition)

Indigo berry

(Bot.), the fruit of the West Indian shrub Randia aculeata, used as a blue dye. — Indigo bird (Zoöl.), a small North American finch 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 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 I. tinctoria, or common indigo plant, the I. Anil, a larger species, and the I. 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 (Zoöl.), 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.