• adultress

Fromadulter(noun) +‎-ess oradulterer +‎-ess.

adulteress (pluraladulteresses)

1. A femaleadulterer, a marriedwoman orwife who commitsadultery.
   • 1611,The Holy Bible, […] (King James Version), London:[…]Robert Barker, […],→OCLC,Ezekiel23:45:

     And the righteous men, they shall iudge them after the manner ofadulteresses, and after the manner of women that shed blood; because they areadulteresses, and blood is in their handes.

• adulterer(gender-neutral)
• advoutress(obsolete)

• Truesdales