εἶρος
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)
εος, τό,
A wool, Od.4.135,9.426. II = γναφάλλιον, Ps.- Dsc.3.117. III a kind of fever, Hp. ap. Erot. (with other expll.).