/ Dictionary / Index B Byzas: Meaning and Definition of Find definitions for: By•zas Pronunciation: (bī'zus), [key] — n. a son of Poseidon and the eponymous founder of Byzantium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Byzantium Bz. Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language