Where does “ἀμφιδέα” come from?

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

ἀμφιδέα (Ancient Greek): Anything that binds or is bound around, bracelet...

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	ἀμφιδέω	To bind around
2	Ancient Greek	ἀμφί
3	Ancient Greek	ὀξύς	sharp, pointed; sharp, keen; quick, hasty, swift
4	Proto-Indo-European	h₂eḱ-	sharp