Definition of "propylaeon"

propylaeon

noun
plural propylaeons or propylaea
1. (historical contexts, especially Ancient Greece and Ancient Rome) Alternative form of propylaeum.
  Quotations
  Beyond these is the first great propylaeon; then, as you advance, a second and a third; their number not being limited any more than that of the sphinxes, but both varying in various temples, as well as the length and breadth of the dromus.
  1831, John Lempière, Bibliotheca Classica, s.v. "Æegyptus" § 18