Lewis & Short

circŭlātor, ōris, m. [circulor].

  1. I. A pedler: auctionum, Asin. ap. Cic. Fam. 10, 32, 3.
  2. II. A mountebank, quack, Cels. 5, 27, 3; Petr 68, 6; Dig. 47, 11, 11; Sen. Ben. 6, 11, 2; App. M. 1, p. 103, 38.
    Of noisy philosophers, Sen. Ep. 29, 5