/ Dictionary / Index C chalcidicum: Meaning and Definition of Find definitions for: chal•cid•i•cum Pronunciation: (kal-sid'i-kum), [key] — pl. -ca an annex of an ancient Roman basilica. an annex or appendage, esp. a narthex, of an early Christian basilica. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Chalcidice Chalcis Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language