τριακοντάκωπος

ον, Subst.
A. thirty-oared, as Subst., [sc. ναῦς] Plb. 21.43.13 (τριακοντόκωπον codd., τριάκοντα κωπῶν Mommsen).
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project