prooemior
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)
Latin > English (Lewis & Short)
prŏoemĭor: āri, v. dep. prooemium,
I to make an introduction or preface (postAug.): prooemiatur apte, Plin. Ep. 2, 3, 3; Sid. Ep. 4, 3.