ἀτρέκεια
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
English (LSJ)
ἡ, Ion. ἀτρεκ-είη, also ἀτρεκίη Man.3.229: (ἀτρεκής):—
A precise truth, certainty, Pi.Fr.213.4; τῶν ἡμεῖς ἀτρεκείην ἴδμεν Hdt.4.152, cf. 6.1; μαθεῖν . . τὴν ἀ. ὅτι οὐκ αἱρέει learnt for certain that he is unable to take it, ib.82, cf. IG9(1).880 (Corc.): in pl., τὰς -ας τὰς λεγομένας Hp.Prorrh.2.3. II Ἀτρέκεια personified, Strict Justice, Pi. O.10(11).13, E.Fr.91.