Propylaeum

·noun Any court or vestibule before a building or leading into any inclosure.

propylaeum
prŏpylaeum (-laeon), or prŏpy-lon, i, n., = προπύλαιον, a gateway , entrance; esp. (in plur.) of...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.