inveteratio
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.
Latin > English (Lewis & Short)
invĕtĕrātĭo: ōnis, f. invetero,
I inveterateness; hence, an inveterate disease, Cic. Tusc. 4, 37, 81.