Where does “angularius” come from?

angularius (Latin) comes from Latin Angulus, from Proto-Indo-European h₂engulos, from Proto-Indo-European h₂eng- — curve, bend.

Ancestry of “angularius”, step by step

Step	Language	Word	Meaning
1	Latin	Angulus	—
2	Proto-Indo-European	h₂engulos	joint?
3	Proto-Indo-European	h₂eng-	curve, bend

angularius — Etymology, Origin & Word History | Etymology Explorer