Source : Webster's Revised Unabridged Dictionary (1913)

Anil \An"il\, n. [F. anil, Sp. an[=i]l, or Pg. anil; all fr. Ar.
   an-n[=i]l, for al-n[=i]l the indigo plant, fr. Skr. n[=i]la
   dark blue, n[=i]l[=i] indigo, indigo plant. Cf. {Lilac}.]
   (Bot.)
   A West Indian plant ({Indigofera anil}), one of the original
   sources of indigo; also, the indigo dye.

Source : WordNet®

anil
     n 1: a blue dye obtained from plants or made synthetically [syn:
          {indigo}, {indigotin}]
     2: shrub of West Indies and South America that is a source of
        indigo dye [syn: {Indigofera suffruticosa}, {Indigofera
        anil}]