Where does “cyclo-” come from?

cyclo- (French) comes from Ancient Greek κύκλος, from Proto-Indo-European kʷékʷlos, from Proto-Indo-European kʷel- — to turn.

cyclo- (French): cyclo-

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	κύκλος	circle, ring; Any circular object, such as a...
2	Proto-Indo-European	kʷékʷlos	wheel; circle
3	Proto-Indo-European	kʷel-	to turn

cyclo- — Etymology, Origin & Word History | Etymology Explorer