proscenium

/proʊˈsiːniəm/
noun
  1. The part of a theater stage that is in front of the curtain, including the arch that frames the stage.
    • During the play, the spotlight focused on the proscenium arch.
    • The actors stood at the edge of the proscenium to deliver their final lines.
    • The old theater had a beautifully decorated proscenium with gold trim.