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indigo

noun [U]
 
 
/ˈɪn.dɪ.ɡəʊ/ US  /-ɡoʊ/

Definition

a bluish-purple colourLess common coloursCommon colours indigo
 
 
adjective
having a bluish-purple colour
(Definition of indigo noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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