Where does “congius” come from?

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

congius (English): An ancient Roman unit of volume in liquid measure...

Definitions

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