From Longman Dictionary of Contemporary Englishindigoin‧di‧go /ˈɪndɪɡəʊ $ -ɡoʊ/ noun [uncountable] CCa dark purple-blue colour → purple —indigo adjective
Examples from the Corpus
indigo• Otherwise, architecture was largely reduced to stubby tower-tops, inky and indigo, from which hostile fire poured.• On the far side of the islet the rocks plunged precipitously away into a mesmeric blind indigo.• Dark, sensuous lilac is derived from the Persian word for midnight blue indigo, itself an import from the Indus.• We passed like wraiths gripping our anoraks against a colder night wind coming down from the deep indigo silhouetted mountains.• The Blessed Virgin as Stella Maris, the star of the sea, deepest indigo blue, sparkling.• Male indigo birds sport beautiful metallic blue plumage, while male whydahs sometimes possess spectacularly long tails.• The landlords thereupon ordered their sharecroppers to plant no indigo and, simultaneously, increased the rent.• And the solid indigo of his intention shocked her.Origin indigo (1500-1600) Italian Latin indicum, from Greek indikos “Indian” 