Lewis & Short

circŭlor, ātus, 1, v. dep. [circulator].

  1. I. To form a circle (of men) about one’s self, or to gather in a company or circle for conversation, * Cic. Brut. 54, 200: totis vero castris milites circulari et dolere, etc., Caes. B. C. 1, 64.
    Hence,
  2. II. Of mountebanks, to collect people around one’s self, Sen. Ep. 40, 3; 52, 7.