στρογγυλοναύτης
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
English (LSJ)
ου, ὁ,
A merchant-seaman, Ar.Fr.861.
German (Pape)
[Seite 955] ὁ, der auf einem runden oder Kauffahrteischiffe Fahrende, Ar. bei Poll. 7, 190.