Where does “angularis” come from?

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

Ancestry of “angularis”, step by step

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

angularis — Etymology, Origin & Word History | Etymology Explorer