πεντηκόντερος

A. ship with fifty oars, Pi. P. 4.245, IG 12.23, Hdt. 1.152, al., Th. 1.14 ; πεντηκόντ‐ορος 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
A Greek-English Lexicon, 1940
An open-access project