Where does “culminatus” come from?

culminatus (Medieval Latin) comes from Latin culmen, from Proto-Italic kolamen, from Proto-Indo-European ḱelH- — to freeze.

Ancestry of “culminatus”, step by step

Step	Language	Word	Meaning
1	Latin	culmen	stalk; top, roof, summit, peak; height, acme
2	Proto-Italic	kolamen	—
3	Proto-Indo-European	ḱelH-	to freeze

culminatus — Etymology, Origin & Word History | Etymology Explorer