exonarthex

[ek-soh-nahr-theks]

noun

a covered walk, vestibule, or narthex situated before a narthex; an outer narthex.

Origin of exonarthex

First recorded in 1840–50; exo- + narthex

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The exonarthex deserves special attentions on account of its façade.
Byzantine Churches in Constantinople
Alexander Van Millingen
The exonarthex has disappeared and the old principal entrance is walled up.
Byzantine Churches in Constantinople
Alexander Van Millingen