What does anil mean?
The definition of anil
An”il, n.
Etym: [F. anil, Sp. anil, or Pg. anil; all fr. Ar. an-nil, for al-nil the indigo plant, fr. Skr. nila dark blue, nili indigo, indigo plant. Cf. Lilac.] (Bot.)

A West Indian plant (Indigofera anil), one of the original sources of indigo; also, the indigo dye.