American Heritage Dictionary
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
To get more oars all on one tier you must make a longer boat, but you could not increase the beam, for, if you did, the whole craft would get so heavy that it would not row rapidly; and the penteconter was already so long in relation to its beam as to be somewhat unsafe.— A Day in Old Athens; a Picture of Athenian Life
Some of these island contingents contained a type of ship different from the triremes, the penteconter.— A History of Sea Power
The penteconter was an early prototype of the galley of the Christian era.— A History of Sea Power
Set them by the boat mast, so the sail can hide our pretty deed from the penteconter.— A Victor of Salamis
Lars’s clamour could surely be heard on the penteconter.— A Victor of Salamis

Century Dictionary (2)
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