Definition of trierarch
1 : the commander of a trireme
2 : an Athenian citizen who had to fit out a trireme for the public service
From the M-W Editors
Origin and Etymology of trierarch
Latin trierarchus, from Greek triērarchos, from triērēs trireme (from tri- + -ērēs — akin to Latin remus oar) + -archos -arch — more at row
First Known Use: circa 1656
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