πεντηκοστήρ

ῆρος, ὁ
A. commander of fifty men, name of an officer in the Spartan army, Th. 5.66, X. An. 3.4.21 :—written πεντηκοστήρ in Id. Lac. 11.4, 13.4, HG 3.5.22, 4.5.7.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project