/ Dictionary / Index P proscenium: Meaning and Definition of Find definitions for: pro•sce•ni•um Pronunciation: (prō-sē'nē-um, pru-), [key] — pl. -ni•a Also calledthe arch that separates a stage from the auditorium. Abbr.: pros. (formerly) the apron or, esp. in ancient theater, the stage itself. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: proscenium (Thesaurus) Pros. Atty. prosciutto Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language