δέργμα
From LSJ
Τούτῳ τῷ λόγῳ χρήσαιτο ἄν τις ἐπ' ἐκείνων τῶν ἀνθρώπων οἳ παραδόξως ἀλαζονεύονται, μηδὲ τὰ κοινὰ τοῖς ἀνθρώποις ἐπιτελεῖν δυνάμενοι → One would use this fable for those who give themselves unreasonable airs, but can't handle everyday life (Aesop 40)
English (LSJ)
ατος, τό, (δέρκομαι)
A look, glance, κυανοῦν λεύσσων δέργμα δράκοντος looking the look of... A.Pers.82, cf. E.Med.187, ect. II thing seen, sight, Orph.L.339.
German (Pape)
[Seite 548] τό, der Blick, Anblick, Aesch. Pers. 82; Eur. Hec. 1251 u. öfter.
Greek (Liddell-Scott)
δέργμα: τό, (δέρκομαι) βλέμμα, “'ματιά”, κυανοῦν λεύσσων δέργμα δράκοντος, ἔχων τὸ βλέμμα …, βλέπων ὡς …, Αἰσχύλ. Πέρσ. 83, πρβλ. Εὐρ. Μηδ. 187, κτλ.· - παρ᾿ Ἡσυχ. ὡσαύτως δεργμός, οῦ, ὁ.