ἦχος
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)
ὁ, later form of ἠχή, Arist.Aud.804a30, Theoc.27.57, Ep.Hebr.12.19, Ael.Tact.35.3, etc.; τεττίγων λιγὺν ἦ. Call.Aet.Oxy. 2079.29 (ἧχον Pap.);
A παγᾶς Mosch.Fr.1.12; αὐλοῦ Id.2.98; οἱ τῶν πριόνων ἦχοι A.D.Synt.290.24; of the sound of words, opp. sense, Phld.Rh.2.258S.; ἦχοι καὶ ψόφοι ib.1.150S.; τῆς φωνῆς ὁ ἦ. ἐν ταῖς ἀκοαῖς παραμένει Luc.Nigr.7; γραμμάτων Demetr.Eloc.71; ἦ. ἐν ὠσί, or abs., ἦχοι, ἦχος, ringing in the ears, Hp.Coac.189, 190, Prorrh.1.18, Thphr.Sens.19; ἦχοι ὤτων Aret.SA1.5. 2 echo, Arist.Pr.899b30. 3 Gramm., breathing, ἦχοι ὁ μὲν δασύς, ὁ δὲ ψιλός Demetr. Eloc.73. 4 voice, τὸν ἦ. εὔτονον καὶ λαμπρὸν ἀποτελεῖ Dsc.5.17. (ἦχος, τό, is found in LXXJe.28(51).16, dub. in Ev.Luc.21.25.)