Lewis & Short

autŏmătārĭus, a, um, adj. [v. automatus].

  1. I. Of or pertaining to an automaton, automatic; hence,
  2. II. Subst.
    1. A. autŏ-mătārĭus, ii, m., a maker of automata, Inscr. Orell. 4150.
    2. B. autŏmătārĭ-um, ii, n. (sc. opus), automaton-work, Dig. 30, 41 fin.