σύνδενδρος
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 thickly-wooded, Dicaearch.1.8, Plb.12.4.2, Sch.Il.Oxy.1086.10; τόποι Arr.Tact.27.4; ὕλη Babr.43.1; ἔν τινι συνδένδρῳ in a thickly-wooded place, Plu. 2.310e.
German (Pape)
[Seite 1006] dicht mit Bäumen besetzt; waldig; νῆσος, Pol. 12, 4, 2; ὕλη, Babr. 43, 11; – τὸ σύνδενδρον, die Waldung, das Dickicht.