Fromadulter +‎-er.

• (Received Pronunciation)IPA^(key):/əˈdʌltəɹə/
• (General American)IPA^(key):/əˈdʌltəɹɚ/

• Audio(US):

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adulterer (pluraladulterers)

2. (loosely) One who commitsadultery.

   Synonyms:cheater;see alsoThesaurus:libertine

   2. (law,strictly) A spouse who has sex with a non-spouse.

      Coordinate term:fornicator

   • 2009,Garner's Modern American Usage‎^[1], page22:

     Under the canon-law rule, a married participant is anadulterer and an umarried one is a fornicator.

   2. (nonlegal,loosely) Someone whocheats on theirspouse ormonogamoussignificant other.
   4. A male adulterer specifically.

      Coordinate term:adulteress(female counterpart)

      • 2005,The Great Life: Essays on Doctrine and Holiness‎^[2], page140:

        I become an adulterer and remain anadulterer when, by choice, I freely adopt the proposal to have sex with someone other than my wife.

      • 2016,Freedom From The Sin of Adultery And Fornication‎^[3], page110:

        The Word of God says that you, my reader, should be sure that no fornicator oradulterer or adulteress has any inheritance in the Kingdom of Christ and of God.

• adulterant

adulterer

1. first-personsingularpresentpassivesubjunctive ofadulterō