Lewis & Short

Gnătho, ōnis, m., = Γνάθων,

  1. I. a parasite in the Eunuchus of Terence; hence used to denote a parasite in gen., Cic. Lael. 25, 93 sq.; id. Phil. 2, 6, 15; Sid. Ep. 3, 13.
  2. II. Deriv.: Gnăthōnĭci, ōrum, m., qs. disciples of Gnatho, Gnathonites, i. e. parasites, Ter. Eun. 2, 2, 33.