Where does “φόσσα” come from?

φόσσα (Byzantine Greek) comes from Latin fossa, from Latin fodiō, from Proto-Indo-European bʰod- — to pierce, dig.

Ancestry of “φόσσα”, step by step

Step	Language	Word	Meaning
1	Latin	fossa	ditch, trench, moat; gutter, waterway; grave
2	Latin	fodiō	—
3	Proto-Indo-European	bʰod-	to pierce, dig

φόσσα — Etymology, Origin & Word History | Etymology Explorer