noun, plural indigos, indigoes.
a blue dye obtained from various plants, especially of the genus Indigofera, or manufactured synthetically.
indigo blue ( def 2 ).
any of numerous hairy plants belonging to the genus Indigofera, of the legume family, having pinnate leaves and clusters of usually red or purple flowers.
a color ranging from a deep violet blue to a dark, grayish blue.
Also called indigo-blue, indigotic. of the color indigo.

1545–55; < Spanish or Portuguese, variant of índico < Latin indicum < Greek indikón, noun use of neuter of Indikós Indic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
indigo (ˈɪndɪˌɡəʊ)
n , pl -gos, -goes
1.  Also called: indigotin a blue vat dye originally obtained from plants but now made synthetically
2.  Compare wild indigo any of various tropical plants of the leguminous genus Indigofera, such as the anil, that yield this dye
3.  a.  any of a group of colours that have the same blue-violet hue; a spectral colour
 b.  (as adjective): an indigo carpet
[C16: from Spanish indico, via Latin from Greek Indikos of India]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1555, from Sp. indico, Port. endego, and Du. (via Port.) indigo, all from L. indicum "indigo," from Gk. indikon "blue dye from India," lit. "Indian (substance)," neut. of indikos "Indian," from India (see India). Earlier name in Mediterranean languages was annil, anil (see aniline).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These conquistadors began gold mining, soon enhancing this with industries in
  sugar, coffee and indigo.
The sections that shine in shades of pale indigo are regions of fine dust
  reflecting starlight.
Peaks, bathed in reflected light, turn purple and pink under an indigo sky.
Indigo ran in and did a cartwheel, screaming for her father to look.
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