1. proscenium, apron, forestage -- (the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain))
2. proscenium, proscenium wall -- (the wall that separates the stage from the auditorium in a modern theater)
1.
An exquisite dulcet epithalame of most mollificative suadency for juveniles amatory whom the odoriferous flambeaus of the paranymphs have escorted to the quadrupedal proscenium of connubial communion. - from Ulysses by James Joyce