ἐτυμολογέω
From LSJ
Μισῶ σοφιστήν, ὅστις οὐχ αὑτῷ σοφός → I hate the sage who is not wise for himself → Odi professum sapere, qui sibi non sapit → Den Weisen hass' ich, der in eigner Sache Tor
English (LSJ)
A argue from etymology, Diogenian. Epicur.2.18, Gal. 5.214. II analyse a word and find its origin, Πλάτων -λογῶν τὸν οἶνον Ath.2.35b, cf. Corn.ND32; ἐ. τι ὰπό τινος ib. 1, Str.1.2.34; ἔκ τινος An.Ox.3.220; παρά τι EM220.37; πρός τι Phlp.in de An.92.4:—Pass., -εῖσθαι ταῖς Ἑλληνικαῖς φωναῖς Str.13.1.52.
