Where does “crenation” come from?

crenation (English) comes from Latin crenatus, from Latin -ātus, from Proto-Italic -ātos, from Proto-Indo-European -éh₂tos.

crenation (English): The contraction of, or formation of abnormal...

Definitions

Step	Language	Word	Meaning
1	Latin	crenatus	notched; crenate
2	Latin	-ātus	—
3	Proto-Italic	-ātos	—
4	Proto-Indo-European	-éh₂tos	—

crenation — Etymology, Origin & Word History | Etymology Explorer