Where does “ἰᾱτρο-” come from?

ἰᾱτρο- (Ancient Greek) comes from Ancient Greek ἰατρός, from Ancient Greek ἰάομαι — I cure, I heal; I repair.

Ancestry of “ἰᾱτρο-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ἰατρός	physician, surgeon, medical doctor
2	Ancient Greek	ἰάομαι	I cure, I heal; I repair