Meaning of ADULTERER in English

ADULTERER

a ‧ dul ‧ ter ‧ er /əˈdʌlt ə rə $ -ər/ BrE AmE noun [countable]

someone who is married and has sex with someone who is not their wife or husband

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.