Vomitorium

A vomitorium is a passage situated below or behind a tier of seats in an amphitheatre or a stadium, through which big crowds can exit rapidly at the end of an event. They can also be pathways for actors to enter and leave stage. The Latin word vomitorium, plural vomitoria, derives from the verb vomō, vomere, "to spew forth". In ancient Roman architecture, vomitoria were designed to provide rapid egress for large crowds at amphitheatres and stadia, as they do in modern sports stadia and large theatres.