cuckold
noun /ˈkʌkəʊld/
/ˈkʌkəʊld/
(old use, disapproving)- a man whose wife has sex with another manWord Originlate Old English, from Old French cucuault, from cucu ‘cuckoo’ (from the cuckoo's habit of laying its egg in another bird's nest). The equivalent words in French and other languages applied to both the bird and the adulterer; cuckold has never been applied to the bird in English.