Source : Webster's Revised Unabridged Dictionary (1913)

Kohl \Kohl\, n. [See {Alcohol}.]
   A mixture of soot and other ingredients, used by Egyptian and
   other Eastern women to darken the edges of the eyelids.

Source : WordNet®

kohl
     n : a cosmetic preparation used by women in Egypt and Arabia to
         darken the edges of their eyelids