Where does “κόγγιον” come from?

κόγγιον (Ancient Greek) comes from Latin congius, from Ancient Greek κογχίον, from Ancient Greek κόγχη, from Proto-Indo-European ḱongʰ- — shell, mussel.

κόγγιον (Ancient Greek): congius, an ancient Roman unit of measure

Definitions

congius, an ancient Roman unit of measure

Ancestry of “κόγγιον”, step by step

Step	Language	Word	Meaning
1	Latin	congius	congius, a unit of volume and weight, roughly...
2	Ancient Greek	κογχίον	—
3	Ancient Greek	κόγχη	shell, mussel; apse; mussel; shell
4	Proto-Indo-European	ḱongʰ-	shell, mussel

Every word from Proto-Indo-European ḱongʰ- →Every word from Ancient Greek κόγχη →Every word from Ancient Greek κογχίον →