τρίφθογγος
From LSJ
οὐκ ἐν τῷ πολλῷ τὸ εὖ, ἀλλ' ἐν τῷ εὖ τὸ πολύ → good is not found in plenty but plenty in good, quality matters more than quantity
English (LSJ)
ἡ,
A a triple vowel-sound, Tz.H.12.242: as Adj. τρίφθογγος, ον, having three voices, PMag.Par.1.2820.
Greek (Liddell-Scott)
τρίφθογγος: -ον, ὁ τριπλοῦν ἔχων φθόγγον ἢ φωνῆεν, τὰς διφθόγγους καὶ τὰς τριφθόγγους Τζέτζ. Ἱστ. 12, 244.