the part of the stage in a theatre that is in front of the curtaina traditional theatre with a proscenium arch(= one that forms a frame for the stage where the curtain is opened)Wordfinderstagebackdrop,costume,curtain,footlights,prop,proscenium,scenery,set,stage,the wingsOxford Collocations DictionaryProscenium is used before these nouns: archSeefull entrySee related entries:In the theatreWord Originearly 17th cent.: via Latin from Greek proskēnion, from pro ‘before’ + skēnē ‘stage’.
See proscenium in the Oxford Advanced American Dictionary
