τερέτισμα
From LSJ
τὸ δὲ ποιεῖν ἄνευ νοῦ ἃ δοκεῖ καὶ σὺ ὁμολογεῖς κακὸν εἶναι: ἢ οὔ → but doing what one thinks fit without intelligence is—as you yourself admit, do you not?—an evil
English (LSJ)
ατος, τό,
A a humming, twanging, φορμίγγων Diog. ap. D.L.6.104 (alluding to E.Fr.200), Luc.Nigr.15, AP7.612, cf. 11.352 (both Agath.); chirruping of cicadas, Hsch. II metaph., a mere sound or twittering, τερετίσματα τὰ εἴδη (the Platonic ideas) Arist.APo.83a33; τὰ συνήθη ταῦτα τ. the ordinary prattle, Procop.Gaz.Ep.33; τὸ πόημα οὐχ ὡς τ. καὶ κροῦμα νοοῦμεν Phld.Po.2p.228H.
German (Pape)
[Seite 1093] τό, = Folgdm; Luc. Nigr. 15; ἀντίτυπον, Agath. 68 (XI, 352); φορμίγγων, 91 (VII, 612).