Where does “quinquangulus” come from?

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

quinquangulus (Latin): pentagonal

Definitions

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

quinquangulus — Etymology, Origin & Word History | Etymology Explorer