ἐπινύμφειος
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)
ον,
A bridal, ὕμνος prob. in S.Ant.814(lyr.): fem. -είη Supp.Epigr.2.874 (nisi ἐπὶ νυμφείην).
Greek (Liddell-Scott)
ἐπινύμφειος: -ον, = ἐπινυμφίδιος, ἐκ διορθώσεως τοῦ Δινδ. ἐν Σοφ. Ἀντ. 814.