Word Origin & History
narthex"porch at the end of early churches" (used by penitents not admitted to the body of the church), 1673, from Late Gk. narthex, from Gk. narthex "giant fennel," of unknown origin. The architectural feature so called from fancied resemblance of porch to a hollow stem. The word also was used in Gk. to mean
"a small case for unguents, etc."