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n. pl. vom·i·to·ri·a (-tôr′ē-ə)
a. One of the tunnellike passages of a theater, stadium, or amphitheater connecting the banks of seats with an outside wall or passageway.
b. A tunnellike passage extending to a theater stage, especially a thrust stage or the stage of an arena theater, allowing actors to enter and exit. In both subsenses also called vomitory.
2. A place for vomiting, sometimes mistakenly said to be an invention of the ancient Romans for use during banquets.

[Latin vomitōrium, entrance to an amphitheater, from neuter singular of Latin vomitōrius, of spewing forth, emetic, vomitory (a vomitorium being so called because the spectators spewed forth from its opening); see vomitory.]