Lewis & Short

exercĭtor, ōris, m. [exerceo, II.], an exerciser, trainer (ante- and post-class.)

  1. I. Prop.: huic Gurgulio’st exercitor, is hunc hominem cursuram docet, Plaut. Trin. 4, 3, 9; 2, 1, 4, Macr. Somn. Scip. 2, 14 med.
  2. II. Transf., one who exercises or practises any profession, business, calling: cauponae aut stabuli, an innkeeper, Dig. 44, 7, 4 fin.: navis, ratium, a ship-master, captain, ib. 14, 1, 1; 4, 9, 1; Inscr. Grut. 492, 5.