/ ˈsuːdənɪm; NAmE ; BrE also ˈsjuː-/ noun
a name used by sb, especially a writer, instead of their real name :
She writes under a pseudonym .
—compare pen-name
► pseud·onym·ous / suːˈdɒnɪməs; sjuː-; NAmE suːˈdɑːn-/ adjective
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WORD ORIGIN
mid 19th cent.: from French pseudonyme , from Greek pseudōnymos , from pseudēs false + onoma name.