θνῆσις
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)
εως, ἡ,
A mortality, in a plague, Ruf.Fr.69; πολλὴ θ. γέγονε Stud.Pal.22.338 (i A.D.); νηπίων Cat.Cod.Astr.7.126.