Cratylus (405)

Socrates. I will try to tell you what I think about it; for no single name could more aptly indicate the four functions of the god, touching upon them all and in a manner declaring his power in music, prophecy, medicine, and archery.

Hermogenes. Go on; you seem to imply that it is a remarkable name.

Socrates. His name and nature are in harmony; you see he is a musical god. For in the first place, purification and purgations used in medicine and in soothsaying, and fumigations with medicinal and magic drugs, and the baths and sprinklings connected with that sort of thing all have the single function of making a man pure in body and soul, do they not?

Hermogenes. Certainly.

Socrates. But this is the god who purifies and washes away (ἀπαλοούων) and delivers (ἀπολύων) from such evils, is he not?

Hermogenes. Certainly.

Socrates. With reference, then, to his acts of delivering and his washings, as being the physician of such diseases, he might properly be called Apoluon (ἀπαλούων, the washer), and with reference to soothsaying and truth and simplicity—for the two are identical—he might most properly be called by the name the Thessalians use; for all Thessalians call the god Aplun. And because he is always by his archery controller of darts (βολῶν) he is ever darting (ἀεὶ βάλλων). And with reference to music we have to understand that alpha often signifies together, and here it denotes moving together in the heavens about the poles, as we call them, and harmony in song, which is called concord; for, as the ingenious musicians and astronomers tell us, all these things move together by a kind of harmony. And this god directs the harmony, making them all move together, among both gods and men; and so, just as we call the ὁμοκέλευθον (him who accompanies), and ὁμόκοιτιν (bedfellow), by changing the ὁμο to alpha, ἀκόλουθον and ἄκοιτιν, so also we called him Apollo who was Homopolo, and the second lambda was inserted, because without it the name sounded of disaster (ἀπολῶ, ἀπόλωλα, etc.).