Where does “circumaratus” come from?

circumaratus (Latin) comes from Latin circumaro, from Latin circum-, from Latin circum, from Latin circus, from Ancient Greek κρίκος, from Proto-Indo-European (s)ḱer- — dung, manure, filth; manure, dung, filth.

Definitions

Ancestry of “circumaratus”, step by step

Step	Language	Word	Meaning
1	Latin	circumaro	I plough around
2	Latin	circum-	circum- round, about
3	Latin	circum	about, around; in a circle, all around, on both...
4	Latin	circus	a circular line or orbit; circle, ring; a...
5	Ancient Greek	κρίκος	ring
6	Proto-Indo-European	(s)ḱer-	dung, manure, filth; manure, dung, filth

Every word from Proto-Indo-European (s)ḱer- →Every word from Ancient Greek κρίκος →Every word from Latin circus →