n.

1. 【化】靛蓝，靛青；靛蓝染料[U]
2. 槐蓝属植物[C]
3. 靛蓝色，靛色[U]

a.

1. 靛蓝色的

n.

1. a tropical plant formerly widely cultivated as a source of dark blue dye. [Indigofera tinctoria and related species.]
2. the dark blue dye obtained from the indigo plant.
   ▸a colour between blue and violet in the spectrum.