NARTHEX n.
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.
PORCH n.
A portico; a covered walk. [Obs.] Repair to Pompey's porch, where you shall find find us. Shak. The Porch, a public portico, or great hall, in Athens, where Zeno, the philosopher, taught his disciples; hence, sometimes used as equivalent to the school of the Stoics. It was called "h poiki`lh stoa`. [See Poicile.]…