noun, plural prop·y·lae·a [prop-uh-lee-uh] /ˌprɒp əˈli ə/.
Origin of propylaeum
Examples from the Web for propylaeum
At Frankfort the dead-house occupies one of the wings of the propylaeum, which forms the main entrance to the cemetery.
These, with the Propylaeum, before mentioned, come out wonderfully against a blue sky.Saunterings|Charles Dudley Warner
Magazines with fine painted store jars came to light beneath the floor of the later “propylaeum.”
Here the visitor found another portal or propylaeum of a magnificent character.