Source : Webster's Revised Unabridged Dictionary (1913)

Adulterer \A*dul"ter*er\, n. [Formed fr. the verb adulter, with
   the E. ending -er. See {Advoutrer}.]
   1. A man who commits adultery; a married man who has sexual
      intercourse with a woman not his wife.

   2. (Script.) A man who violates his religious covenant.
      --Jer. ix. 2.

Source : WordNet®

adulterer
     n : someone who commits adultery or fornication [syn: {fornicator}]