UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈdʌltərər/US:USA pronunciation: respellingUSA pronunciation: respelling(ə dultər ər)

WordReference Random House Unabridged Dictionary of American English © 2020
a•dul•ter•er  (ə dultər ər),USA pronunciation n. 
  1. a person who commits adultery.
  • Latin
  • Old French
  • Latin, back formation from adulterāre to defile; see adulterate) + -er1; replacing Middle English avouter, avoutrer
  • earlier adulter adulterer ( 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::
adulterer /əˈdʌltərə/ n
  1. a person who has committed adultery
Etymology: 16th Century: originally also adulter, from Latin adulter, back formation from adulterāre to adulterate
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