vomitorium

noun2

1. •
   A passage located behind a tier of seats in an amphitheatre used as an exit for the crowds

   • In the tunnel to the right and left as one enters there is a passage which contains a flight of steps conducting to a "vomitorium," situated in the second "praecinctio;" […] — 1844
2. •
   An area in which vomiting takes place, in particular a chamber supposedly used by ancient Romans to vomit during a feast so they could continue eating.

   • In the rich man's house the vomitorium became an essential chamber: the place where the guzzler of rich food emptied his stomach, so that he might come back to the feast for more. — 1944