Definition of pentecontarch in English:

pentecontarch

noun

  • Ancient History. A person in charge of a fifty-oared ship; the commander of a penteconter.

Origin

Late Middle English (in an earlier sense). From post-classical Latin pentecontarchus commander of fifty (Vetus Latina) from ancient Greek πεντηκόνταρχος commander of fifty (at Athens; also in Septuagint) from πεντήκοντα fifty + -αρχος.

Pronunciation

pentecontarch

/pɛntɪˈkɒntɑːk/