Webster's English Dictionary

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proscenium

pro.sce.ni.um \pro--'se--ne--*m\ n [L, fr. Gk proske-nion front of the 
   building forming the background fo]r a dramatic performance, stage, fr. 
   pro- + ske-ne- building forming the background for a dramatic performance - 
   more at SCENE 1a: the stage of an ancient theater  1b: the part of a modern 
   stage in front of the curtain  1c: the wall that separates the stage from 
   the auditorium and provides the  arch that frames it 2: FOREGROUND