GRC
Bailly
ion. c. πεντηκόντορος, HDT. 1, 152, etc.
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LSJ
(sc. ναῦς), ἡ, ship with fifty oars, Pi. P. 4.245, IG1². 23, Hdt. 1.152, al., Th. 1.14 ; πεντηκόντορος is v.l. in Pi. l.c., Hdt. 6.138, Th. l.c., and is found in E. IT 1124 (lyr.), Marm. Par. 15.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ἡ, = πεντηκόντορος, Her. 3.124 u. öfter.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)