Lewis & Short

Parmĕnĭo (-on), ōnis, m., = Παρμενίων, general and adviser of Philip of Macedon and of Alexander the Great.
Form Parmenio, Just. 12, 1, 3.
Form Parmenion, Curt. 7, 2, 8; Val. Max. 6, 4, ext. 3; Just. 12, 5, 3.