/ Dictionary / Index P pseudonym: Meaning and Definition of Find definitions for: pseu•do•nym Pronunciation: (sd'n-im), [key] — n. a fictitious name used by an author to conceal his or her identity; pen name. Cf.(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pseudonym (Thesaurus) pseudonephritis pseudonymity Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language