proscenium
/prəʊˈsiːnɪəm/noun
(pl. prosceniums或proscenia /-nɪə/)
1- the part of a theatre stage in front of the curtain舞台口（舞台的幕前部分）, 台口。
1.1
- short for PROSCENIUM ARCH.PROSCENIUM ARCH的简称。
1.2
- the stage of an ancient theatre古代剧院的舞台。
词源
early 17th cent.: via Latin from Greek proskēnion,from pro 'before'+skēnē 'stage'.