Source : Webster's Revised Unabridged Dictionary (1913)

Delilah \De*li"lah\, n.
   The mistress of Samson, who betrayed him (--Judges xvi.);
   hence, a harlot; a temptress.

         Other Delilahs on a smaller scale Burns met with during
         his Dumfries sojourn.                    --J. C.
                                                  Shairp.

Source : WordNet®

Delilah
     n 1: (Old Testament) the Philistine mistress of Samson who
          betrayed him by cutting off his hair and so deprived him
          of his strength
     2: a woman who is considered to be dangerously seductive [syn:
        {enchantress}, {temptress}, {siren}, {femme fatale}]