nōmenclātor — Lewis & Short
nōmenclātor (nōmencŭlātor, ōris, m.id.,
Mart. 10, 30, 23; Suet. Aug. 19; id. Calig. 41; id. Claud. 34),nomenclatori memoriae loco audacia est,Sen. Ben. 1, 3, 10; id. Ep. 19, 11; id. Ben. 6, 33, 4.—Under the emperors, a slave who told his master the names of the other slaves:
servorum causā nomenclator adhibendus,Plin. 33, 1, 6, § 26.