Definition of indigo adjective from the Oxford Advanced Learner's Dictionary

 

indigo

 adjective
adjective
BrE BrE//ˈɪndɪɡəʊ//
 
; NAmE NAmE//ˈɪndɪɡoʊ//
 
 
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very dark blue in colour an indigo sky Word Origin mid 16th cent.: from Portuguese índigo, via Latin from Greek indikon, from indikos ‘Indian (dye)’, from India.

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