propylaeum
Concise Oxford English Dictionary © 2008 Oxford University Press:
propylaeum /ˌprɒpɪˈliːəm/
▶noun (pl. propylaea /-ˈliːə/) Architecture the entrance to a temple.
– origin via L. from Gk propulaion, neut. (used as n.) of propulaios ‘before the gate’, from pro ‘before’ + pulē ‘gate’.
'propylaeum' also found in these Oxford entries:

