Δύο γὰρ, ἐπιστήμη τε καὶ δόξα, ὧν τὸ μὲν ἐπίστασθαι ποιέει, τὸ δὲ ἀγνοεῖν → Two different things are science and belief: the one brings knowledge, the other ignorance (Hippocrates)
ac CONJ :: and, and also, and besides
ac:
I conj., v. atque.
ac,³ v. atque.
ac, Conjunct., s. atque.