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

indigo

adjective
 
/ˈɪndɪɡəʊ/
 
/ˈɪndɪɡəʊ/
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  1. very dark blue in colour
    • an indigo sky
    Topics Colours and Shapesc2
    Word Originmid 16th cent.: from Portuguese índigo, via Latin from Greek indikon, from indikos ‘Indian (dye)’, from India.
See indigo in the Oxford Advanced American Dictionary
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