Source : Webster's Revised Unabridged Dictionary (1913)

Fornicatress \For"ni*ca`tress\, n. [Cf. F. fornicatrice, L.
   fornicatrix.]
   A woman guilty of fornication. --Shak.

Source : WordNet®

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