1) Ancient Greek title 2) Staff officer 
Hyperetes (ὑπηρέτης; pl. hyperetai) was an Ancient Greek title. It is derived from ἐρέσσω eresso, and therefore originally signifies a rower, but in later times the word was, with the exception of the soldiers or marines, applied to the whole body of persons who performed any service in a vessel. In a still wider sense it was appli...
Staff officer.