/ Dictionary / Index O -onym: Meaning and Definition of Find definitions for: -onym Pronunciation: [key] a combining form of Greek origin, meaning “word,” “name”: pseudonym. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onychophoran onyx Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language