ἀθανασία
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → But for extreme illnesses, extreme remedies, applied with severe exactitude, are the best (Hippocrates, Aphorism 6)
English (LSJ)
ἡ,
A immortality, Pl.Phdr.246a, Arist.EN1111b22, Epicur. Ep.3p.60U., etc.; ὁ δὲ λιμός ἐστιν ἀθανασίας φάρμακον Antiph.86.6. II elixir or antidote, ἀ. Μιθριδάτου Gal.14.148, cf. 13.203. 2 = ἀμβροσία, Luc.DDeor.4.5.