Where does “tetracycle” come from?

tetracycle (English) comes from Ancient Greek τετράκυκλος, from Ancient Greek κῠ́κλος, from Proto-Indo-European kʷékʷlos, from Proto-Indo-European kʷel- — to turn.

tetracycle (English): Any organic compound, containing four rings,...

Definitions

Any organic compound, containing four rings,...

Ancestry of “tetracycle”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	τετράκυκλος	four-wheeled
2	Ancient Greek	κῠ́κλος	circle, ring
3	Proto-Indo-European	kʷékʷlos	wheel; circle
4	Proto-Indo-European	kʷel-	to turn

Every word from Proto-Indo-European kʷel- →Every word from Proto-Indo-European kʷékʷlos →Every word from Ancient Greek κῠ́κλος →