vomitorium (vom-i-TOR-ee-uhm) noun, plural vomitoria
A passageway to the rows of seats in a theater.
[From Latin vomitorium, from vomere (to discharge).]
Vomitoria in ancient amphitheaters helped the audience to reach their seats quickly and then, at the end of the performance, leave at an equal speed (hence the name). Thousands of seats could be filled in minutes. The suggestion that a vomitorium was the place for the ancient Romans to vomit during a feast has no basis.
-Anu Garg (words at wordsmith.org)