Narthex /(?)/

Nar·thex

Narthex

n.
  1. A tall umbelliferous plant (Ferula communis). See Giant fennel, under Fennel. (Bot.)
  2. 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. (Arch.)