ἀρχε-
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)
English (LSJ)
insep. Prefix (from ἄρχω),
A = ἀρχι-, with which it is sometimes interchanged, cf. ἀρχιθέωρος, etc.