Meaning

noun a blue dye obtained from plants or made synthetically

noun deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye

noun a blue-violet color

origin16th century (as indico, modern spelling from the 17th century), Spanish índigo, Portuguese endego (modern índigo), or Dutch (via Portuguese) indigo, all from Latin indicum (“indigo”), from Ancient Greek ἰνδικόν (indikón, “Indian dye”), from Ἰνδία (Indía). Doublet of Indic.

Etymology from Wiktionary, CC BY-SA 3.0