apodixis
From LSJ
Sunt verba voces quibus hunc lenire dolorem possis, magnam morbi deponere partem → Words will avail the wretched mind to ease and much abate the dismal black disease.
Latin > English (Lewis & Short)
ăpŏdīxis: is, f., = ἀπόδειξις,
I a conclusive proof, demonstration, = evidens prebatio, Quint. 5, 10, 7; Petr. 132, 10; Gell. 17, 5, 5 (in Quint. 5, 10, 7 al., written as Greek).