The Collaborative International Dictionary of English v.0.48:

Vomitory \Vom"i*to*ry\, a. [L. vomitorious.]
   Causing vomiting; emetic; vomitive.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vomitory \Vom"i*to*ry\, n.; pl. Vomitories.
   1. An emetic; a vomit. --Harvey.
      [1913 Webster]

   2. [L. vomitorium.] (Arch.) A principal door of a large
      ancient building, as of an amphitheater.
      [1913 Webster]

            Sixty-four vomitories . . . poured forth the immense
            multitude.                            --Gibbon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vomitory
    n 1: an entrance to an amphitheater or stadium