Where does “poligonal” come from?

poligonal (Catalan) comes from Catalan polígon, from Catalan -gon, from Ancient Greek γωνία, from Ancient Greek γόνυ, from Proto-Hellenic gónu, from Proto-Indo-European ǵónu — knee.

poligonal (Catalan): polygonal

Definitions

polygonal

Ancestry of “poligonal”, step by step

Step	Language	Word	Meaning
1	Catalan	polígon	polygon
2	Catalan	-gon	gon
3	Ancient Greek	γωνία	corner, angle; joiner's square; cornerstone
4	Ancient Greek	γόνυ	knee
5	Proto-Hellenic	gónu	knee
6	Proto-Indo-European	ǵónu	knee

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