IPA: //suːˈdɒnɪməs//
KK: /sudˈɒnɪməs/
Relating to a name that someone uses instead of their real name, often to hide their identity or to write anonymously.
The author chose to publish her book under a pseudonymous identity to maintain her privacy.
Pseudonymous → It is formed from "pseudo-" (from Greek "pseudes", meaning false) and "onymous" (from Greek "onuma", meaning name). The word describes a name that is not real or is assumed, hence a false name.
Think of 'false' ('pseudo-') and 'name' ('onymous') to remember that 'pseudonymous' refers to a false name.