Lewis & Short

circĭtor (or circuĭtor, Petr. 53, 10), ōris, m. [for circumitor, from circumeo, lit. one who goes around, hence],

  1. I. A watchman (of gardens. buildings, etc.; postclass.), Auct. Priap. 16, 1, Front. Aquaed. 117; Petr. 1 1.
  2. II. In milit. lang., plur., those who go the rounds and visit the posts of sentinels, patrols, Veg. Mil. 3, 8; Hier. Ep. 61, n. 7.
    Sing.’ CIRCITOR, Inscr. Murat. 540, 2.
  3. III. A pedler, Dig. 14, 3, 5, § 4.