πεντηκοντήρ
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
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.
