velarium Syllabification: (ve·lar·i·um)Pronunciation: /viˈle(ə)rēəm/Definition of velarium noun (plural velaria /-ˈle(ə)rēə/) a large awning of a type used in ancient Rome to cover a theater or amphitheater as a protection against the weather, now more commonly used as an inner ceiling to improve acoustics. Origin:Latinvelarium in other Oxford dictionaries Definition of velarium in the British & World English dictionary