indigo

The story

1. Proto-Indo-Iranian*síndʰuš
2. Sanskritसिन्धु॑ (síndhu)
3. Old Persian𐏃𐎡𐎯𐎢𐏁 (hiⁿdūš)
4. Ancient GreekἸνδός (Indós)
5. Ancient GreekἸνδία (Indía)
6. Ancient GreekἸνδικός (Indikós)
7. LatinIndicu
8. Spanishíndico
9. Spanishíndigo
10. Portugueseendego
11. Spanishíndigo
12. Dutchindigo
13. English todayindigo

16th century (as indico, modern spelling from the 17th century), Spanish índigo, Portuguese endego (modern índigo), or Dutch indigo (via Portuguese), all from Latin indicum (“indigo”), from Ancient Greek ἰνδικόν (indikón, “Indian dye”), from Ἰνδία (Indía). Doublet of Indic. Compare Middle English inde.