| Sacellum 1. (n.) An unroofed space consecrated to a divinity. 2. (n.) A small monumental chapel in a church. Thesaurus Entries Lady chapel, amphitheater, arena, assembly hall, auditorium, chantry, chapel of ease, chapel royal, concert hall, convention hall, dance hall, exhibition hall, gallery, hall, lecture hall, meetinghouse, music hall, opera house, oratorium, oratory, sacellum, sacrament chapel, sacrarium, school chapel, side chapel, stadium, theater |