tueo
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
tueo: ēre, v. tueor.
tŭĕō, ēre, tr., c. tueor : XII T. d. Cic. Leg. 3, 7 || passif : tuebantur *Varro R. 3, 1, 4, ils étaient défendus, cf. *Lucr. 4, 361 ; Papin. Dig. 28, 3, 17 ; Vitr. Arch. 8, præf. 2.