Pronunciation: (prō-sē'nē-um, pru-), [key]
—pl. -ni•aPronunciation: (-nē-u). [key] Theat.
1. Also called prosce'nium arch". the arch that separates a stage from the auditorium. Abbr.: pros.
2. (formerly) the apron or, esp. in ancient theater, the stage itself.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.