/ Dictionary / Index C Chalcedon: Meaning and Definition of Find definitions for: Chal•ce•don Pronunciation: (kal'si-don", kal-sēd'n), [key] — n. an ancient city in NW Asia Minor, on the Bosporus, opposite Byzantium. the ecumenical council held there in a.d. 451. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: chalcedon (Thesaurus) chalcanthite chalcedony Related Content Daily Word Quiz: laudable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language