Meaning of chalcidicum

chal•cid•i•cum

Pronunciation: (kal-sid'i-kum), [key]
— pl. -ca
  1. an annex of an ancient Roman basilica.
  2. an annex or appendage, esp. a narthex, of an early Christian basilica.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.