Where does “πολύγωνος” come from?

πολύγωνος (Greek) comes from Ancient Greek πολύγωνος, from Ancient Greek γωνία, from Ancient Greek γόνυ, from Proto-Hellenic gónu, from Proto-Indo-European ǵónu — knee.

πολύγωνος (Greek): polygonal

Definitions

polygonal

Ancestry of “πολύγωνος”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πολύγωνος	polygonal, many-angled
2	Ancient Greek	γωνία	corner, angle; joiner's square; cornerstone
3	Ancient Greek	γόνυ	knee
4	Proto-Hellenic	gónu	knee
5	Proto-Indo-European	ǵónu	knee

Every word from Proto-Indo-European ǵónu →Every word from Proto-Hellenic gónu →Every word from Ancient Greek γόνυ →