Where does “boira” come from?

boira (Catalan) comes from Latin boreās, from Ancient Greek Βορέας — the north wind, personified as Boreas; the North.

boira (Catalan): fog; mist

Definitions

Step	Language	Word	Meaning
1	Latin	boreās	—
2	Ancient Greek	Βορέας	the north wind, personified as Boreas; the North