It is the name of the plant Indigofera tinctoria that in India was used to produce a bluish color, which was also known in Europe by the same name. It has its etymology in Sanskrit 2344; 2368; 2354; ( niila , "blue" ) , which passed into Persian, Arabic and Hispanic Arabic 1575; 1604; 1606; 1610; 1604; ( an niil ) from where the Spanish took it. See indigo.
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