Nouns

(n)anil, indigo, indigotina blue dye obtained from plants or made synthetically
(n)indigo, indigo plant, Indigofera tinctoriadeciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye
(n)indigoa blue-violet color

Adjectives

(s)indigohaving a color between blue and violet“indigo flowers”