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countable and uncountable, plural indigos or indigoes
A purplish-blue colour quotations examples
The night was considerably clearer than anybody on board her desired when the schooner Ventura headed for the land. It rose in places, black and sharp against the velvety indigo, over her dipping bow, though most of the low littoral was wrapped in obscurity.
1907, Harold Edward Bindloss, chapter 6, in The Dust of Conflict
An indigo-colored dye obtained from certain plants (the indigo plant or woad), or a similar synthetic dye. examples
An indigo plant, such as from species in genera Indigofera, Amorpha (false indigo), Baptisia (wild indigo), and Psorothamnus and Dalea (indigo bush). examples
comparative more indigo, superlative most indigo
having a deep purplish-blue colour examples