Terminology
Most of the warships of the era were distinguished by their names, which were compounds of a number and a suffix. Thus the English term quinquereme derives from Latin quinque-rēmis and has the Greek equivalent πεντ-ήρης. Both are compounds featuring a prefix meaning "five": Latin quinque, ancient Greek πέντε. The Roman suffix is from rēmus, "oar": "five-oar". As the vessel cannot have had only five oars, the word must be a figure of speech meaning something else. There are a number of possibilities. The -ηρης occurs only in suffix form, deriving from ἐρέσσειν, "to row". As "rower" is eretēs and "oar" is eretmon, -ērēs does not mean either of those but, being based on the verb, must mean "rowing". This meaning is no clearer than the Latin. Whatever the "five-oar" or the "five-row" originally meant was lost with knowledge of the construction, and is, from the 5th century on, a hotly debated issue. For the history of the interpretation efforts and current scholarly consensus, see below.
Read more about this topic: Hellenistic-era Warships