Indigo
/ˈɪndəˌɡoʊ/
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Definition
(noun) A purplish-blue color.
Sentence Examples
Jeans manufacturers make denim bluer with indigo dye.
A rainbow consists of red, orange, yellow, green, blue, indigo and violet.
CEFR Practice Quiz
The artist used a deep ____ blue to paint the stormy night sky in her new landscape piece.