proscenium wall

Noun
  1. is a type of: wall - an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure
    has: proscenium arch - the arch over the opening in the proscenium wall
    is a part of: theater stage, theatre stage - a stage in a theater on which actors can perform
    same as: proscenium

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