cuckold

1. a man whose wife is sexually unfaithful, often regarded as an object of derision.

   jokes in literature about elderly cuckolds and misers are rife

1. (of a man) make (another man) a cuckold by having a sexual relationship with his wife.

   in the novel Humberto cuckolds his employer

late 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.