Cuckold meaning : A man married to an unfaithful wife, especially when he is unaware or unaccepting of the fact. A West Indian plectognath fish, Rhinesomus triqueter. The scrawled cowfish, Acanthostracion quadricornis and allied species. To make a cuckold or cuckquean of someone by being unfaithful, or by seducing their partner or spouse.