proseucha
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
prŏseucha: ae, f., = προσευχή,
I a place for prayer, an oratory, Juv. 3, 296; Inscr. Grut. 651, 11.
prŏseucha,¹⁶ æ, f. (προσευχή), synagogue : Juv. 3, 296.