Lewis & Short

vŏcātor, ōris, m. [voco] (post-Aug.), a caller.

  1. I. In gen.: Paulus vocator gentium, Prud. στεφ. 2, 461; Ambros. in Luc. 3, § 33.
  2. II. In partic., a bidder, inviter to dinner, etc., Sen. Ira, 3, 37, 3; Plin. 35, 10, 36, § 89; Suet. Calig. 39; Mart. 7, 85, 11.