pseudonymnoun [ C ]
uk/ˈsjuː.də.nɪm/us/ˈsuː.də.nɪm/a name someone uses instead of their real name, especially on a written work:
She writes under a pseudonym.
George Orwell was a pseudonym - his real name was Eric Blair.
pseudonymous
adjective uk/sjuːˈdɒn.ɪ.məs/us/suːˈdɑː.nə.məs/formal
pseudonymous literature