Boyd’s Bible Dictionary:
(door). In oriental architecture, veranda, colonnade, vestibule (Judg. 3:23; 1 Chron. 28:11; John 10:23). Any passage from street to inner hall (Matt. 26:71).
Strong’s Dictionary of Hebrew Words:
Meaning:
or (shortened) ,ulam {oo-lawm'}; from 481 (in the sense of tying); a vestibule (as bound to the building)