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Indigo

/ˈɪndɪɡoʊ/noun

A deep blue dye obtained from plants of the genus Indigofera, and the colour it produces.

The Greek roots

Ἰνδικόν
Indikón
the Indian thing
+
Ἰνδός
Indós
the Indus, India

Literally: Indian dye

The story of the word

The Greeks called the dye simply Ἰνδικὸν φάρμακον, the Indian preparation, naming it after the country it was shipped from, and Latin shortened this to indicum. Their word for India came in turn from Persian and ultimately from Sindhu, the Sanskrit name of the river. Newton needed a seventh colour to make his spectrum match the seven notes of the scale, so indigo was wedged between blue and violet, which is why nobody can reliably point to it in a rainbow.

How it travelled
Ancient Greek → Latin → Spanish and Portuguese → English
First recorded
16th century

Same family

Indiaindicanindole

In a sentence

The cloth goes into the vat yellow-green and turns indigo in the air.

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