Noun proscenium has 2 senses
  1. proscenium, apron, forestage - the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain)
    --1 is a kind of stage
    --1 is a part of theater stage, theatre stage
    --1 has parts: footlight, footlights; prompt box, prompter's box
  2. proscenium, proscenium wall - the wall that separates the stage from the auditorium in a modern theater
    --2 is a kind of wall
    --2 is a part of theater stage, theatre stage
    --2 has parts: proscenium arch
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