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Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
16th 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.
anil, indigotin
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Classic usage
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