indenyl

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. Englishind(igo)
14. Englishindene
15. Proto-Indo-European*swel-der.?
16. Ancient Greekῡ̔́λη (hū́lē)
17. English todayindenyl

From indene + -yl.