【医】 靛蓝, 靛蓝色

Indigo \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} (Zo["o]l.), 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} (Zo["o]l.), 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.