Where does “αμφιδέξιος” come from?

αμφιδέξιος (Greek) comes from Greek αμφί-, from Ancient Greek ἀμφί, from Ancient Greek ὀξύς, from Proto-Indo-European h₂eḱ- — sharp.

αμφιδέξιος (Greek): ambidextrous; deft

Definitions

Step	Language	Word	Meaning
1	Greek	αμφί-	Alternative form of αμφι-; amphi-, both
2	Ancient Greek	ἀμφί
3	Ancient Greek	ὀξύς	sharp, pointed; sharp, keen; quick, hasty, swift
4	Proto-Indo-European	h₂eḱ-	sharp