indigo 音标拼音: ['ɪndəg
, o] ['ɪndɪg
, o]
n . 靛青,紫蓝色
a . 紫蓝色的
靛青,紫蓝色紫蓝色的
indigo adj 1 :
having a color between blue and violet ; "
indigo flowers "
n 1 :
a blue dye obtained from plants or made synthetically [
synonym :
{
anil }, {
indigo }, {
indigotin }]
2 :
deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers ;
a source of indigo dye [
synonym : {
indigo }, {
indigo plant }, {
Indigofera tinctoria }]
3 :
a blue -
violet color Indigo \
In "
di *
go \,
a .
Having the color of ,
pertaining to ,
or derived from ,
indigo .
[
1913 Webster ]
{
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 .
[
1913 Webster ]
Indigo \
In "
di *
go \,
n .;
pl . {
Indigoes }. [
F .
indigo ,
Sp .
indigo ,
indico ,
L .
indicum indigo ,
fr .
Indicus Indian .
See {
Indian }.]
[
1913 Webster ]
1 .
A kind of deep blue ,
one of the seven prismatic colors .
[
1913 Webster ]
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 }.
[
1913 Webster ]
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 .
[
1913 Webster ]
{
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 .
[
1913 Webster ]
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