/kal sid"i keuhm/ , n. , pl. chalcidica /-keuh/ .
1. an annex of an ancient Roman basilica.
2. an annex or appendage, esp. a narthex, of an early Christian basilica.
[ 1720-30; Chalcidicus Chalkidikós, equiv. to Chalkid- (s. of Chalkís ) CHALCIS + -ikos -IC ]