Lewis & Short

graecor, ātus, 1, v. dep. n. [Graeci], to imitate the Greeks, live in the Greek manner: si Romana fatigat Militia assuetum Graecari, Hor. S. 2, 2, 11; cf.: congraecor, pergraecor.
Hence, * graecātus, a, um, P. a., made or composed in the Greek manner: graecatior epistola, App. Mag. p.329.
Plur. as subst.: graecāti, ōrum, m., imitators of the Grecian mode of life, Tert. Pall. 4.