proscenium
noun
the arch that separates a stage from the auditorium. pros.
The grammatical form denoting more than one person, place, thing, or idea.
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These, however, are sufficient to mark out the circuit of the ancient orchestra, on which the subsequently built proscenia encroached.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various