It means blue. bluish, indigo. It is also one of the common names of several plants from which the tincture for blue color is extracted: Indigofera tinctoria, of the Fabaceae family, Isatis tinctoria, of the Brassicaceae family, or Polygonum tinctorum of the Polygonaceae family. There are also other plntas called anil and that has the same use.
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.
