Lewis Short
circĭtor | circuĭtor (noun M) : (or , Petr. 53, 10), , for circumitor, from circumeo, lit. one who goes around, hence
* A watchman (of gardens. buildings, etc.; postclass.),Auct. Priap. 16, 1, Front. Aquaed. 117; Petr. 1 1.
* 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.
* A pedler, Dig. 14, 3, 5, § 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary