Lewis & Short

annŏtātor (adn-), ōris, m. [annoto].

  1. I. An observer, remarker (post-Aug.): Non ante medium diem distentus solitariā cenā spectator adnotatorque convivis tuis immines, Plin. Pan. 49.
  2. II. In the jurists, the controller of the annual income, Cod. Th. 12, 6, 3.