adulterer

[uh-duhl-ter-er] /əˈdʌl tər ər/
noun
1.
a person who commits adultery.
Origin
1350-1400; earlier adulter adulterer (< Latin, back formation from adulterāre to defile; see adulterate) + -er1; replacing Middle English avouter, avoutrer < Old French < Latin
Can be confused
adulterer, adulterate.
British Dictionary definitions for adulterer

adulterer

/əˈdʌltərə/
noun
1.
a person who has committed adultery
Word Origin
C16: originally also adulter, from Latin adulter, back formation from adulterāre to adulterate
Word Origin and History for adulterer
n.

early 15c., earlier avouter (c.1300), avoutrer (late 14c.), agent noun from obsolete verb adulter "commit adultery; adulterate" (late 14c.), from Latin adulterare "to corrupt" (see adulteration).