The Collaborative International Dictionary of English v.0.48:

Adulteress \A*dul"ter*ess\, n. [Fem. from L. adulter. Cf.
   Advoutress.]
   1. A woman who commits adultery.
      [1913 Webster]

   2. (Script.) A woman who violates her religious engagements.
      --James iv. 4.
      [1913 Webster]

WordNet (r) 3.0 (2006):

adulteress
    n 1: a woman adulterer [syn: adulteress, fornicatress,
         hussy, jade, loose woman, slut, strumpet,
         trollop]