ἐστρίς
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
Adv.
A until three times, thrice, Pi.O.2.68, Pae.Erythr. tit. p.140 P.: better written divisim.
English (Slater)
ἐστρίς
1 three times ὅσοι δ' ἐτόλμασαν ἐστρὶς ἀπὸ πάμπαν ἀδίκων ἔχειν ψυχάν (v. von Fritz, Phronesis, 1957, 85) (O. 2.68) σε χαίρειν ἐστρὶς αὐδάσαισα (Boeckh: εἰς τρὶς) (P. 4.61)