['?nd?g??]
¦ noun (plural indigos or indigoes)
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.
Origin
C16: from Port. indigo, via L. from Gk indikon, from indikos 'Indian (dye)'.