nar·thex /ˈnɑrˌθɛks/
Nar·thex n.
1. Bot. A tall umbelliferous plant (Ferula communis). See Giant fennel, under Fennel.
2. Arch. The portico in front of ancient churches; sometimes, the atrium or outer court surrounded by ambulatories; -- used, generally, for any vestibule, lobby, or outer porch, leading to the nave of a church.
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narthex
n 1: portico at the west end of an early Christian basilica or
church
2: a vestibule leading to the nave of a church