Liddell–Scott–Jones: πεντηκόνταρχ-ος

πεντηκόνταρχ-ος,ὁ, at Athens,

A. commander of fifty men, serving under theτριήραρχος, X. Ath. 1.2 , D. 50.18 , 19 , 24 (wrongly expld. by Harp. ascommander of a πεντηκόντερος).

2. generally,leader of a company of fifty, LXX Ex. 18.21 , 4

Ki. 1.9 .