Definition of propylaeum in English:

propylaeum

noun

Architecture
  • 1The structure forming the entrance to a temple.

    • ‘Distantly inspired by the propylaea on the Acropolis in Athens, it was the first of the ceremonial Doric gateways to rise in modern Europe.’
    • ‘These venturi formed ventilation flues and water storage tanks, together with the entrance propylaea and dramatic earth sculpture, demonstrating the effect the architects were seeking, ‘the earth rises and falls like a human breast’.’
    1. 1.1the Propylaeum The entrance to the Acropolis at Athens.

Origin

Via Latin from Greek propulaion, neuter (used as a noun) of propulaios before the gate, from pro before + pulē gate.

Pronunciation:

propylaeum

/ˌprɒpɪˈliːəm/