indigoyoudaoicibaDictYouDict[indigo 词源字典]
indigo: [16] Etymologically indigo, a blue dye, is the ‘Indian dye’ – so named because supplies of it were obtained from India. The term is an ancient one. It originated in Greek indikón, literally the ‘Indian substance’, a derivative of the adjective Indikós ‘Indian’, and passed via Latin indicum and Spanish indico into English as indico.

This was replaced in the 17th century by the Portuguese form indigo, and it was Portuguese influence, stemming from their commercial activities in India, that really established the term among the European languages (hitherto the commoner term for the dye had been anil, a word of Sanskrit origins). (The name India, incidentally, to which indigo is related, comes ultimately from Old Persian hiñd’u, which originally meant ‘river’, was subsequently applied specifically to the river Indus, and finally became the name for the country through which the Indus flowed.)
=> india[indigo etymology, indigo origin, 英语词源]
indigo (n.)youdaoicibaDictYouDict
1550s, from Spanish indico, Portuguese endego, and Dutch (via Portuguese) indigo, all from Latin indicum "indigo," from Greek indikon "blue dye from India," literally "Indian (substance)," neuter of indikos "Indian," from India (see India). As "the color of indigo" from 1620s. Replaced Middle English ynde (late 13c., from Old French inde, from Latin indicum). Earlier name in Mediterranean languages was annil, anil (see aniline).